Benefits of user-replaceable batteries/fork
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🔋 These are the benefits of user-replaceable batteries in portable consumer electronics such as mobile phones and portable computers, and the problems associated with non-replaceable batteries.
This article explains how non-user-replaceable batteries, also known as non-removable batteries, severely restrict the freedom and convenience of many users of said products, and how the freedom of choice has increasingly diminished during the 2010s decade down to a point where nearly every newly released mobile phone has a battery that is not replaceable by the end user.
Although much of this article applies to other devices such as laptop computers as well, this article mainly is focused on mobile phones due to their heavy reliance on a portable power source, significance and versatility as a highly portable device and due to their greater affliction by the design trend of non-user-replaceable batteries.
A battery only qualifies as user-replaceable if the device meets the following design conditions:
- No glue is used to hold the battery in place.
- The user is able to access the device's battery compartment without:
- using a heat gun,
- damaging any part of the device such as breaking seals,
- exposing delicate internal components such as the device's main board,
- or need for proprietary tools such as a proprietary screw driver.
Laptop computers with user-replaceable batteries and dedicated cameras and camcorders commonly use a slider lock, while mobile phones with user-replaceable batteries use a removable back cover fastened using jigsaw-shaped locks, and the bottom of the battery compartment to hold the battery.
- The great usurpation of user-replaceable batteries
Over time, other phone vendors slowly started succumbing to the slim fragile unibody(euphemism) design trend set by Apple, who successfully marketed it as a cool status symbol to the world, possibly with the help of massive astroturfing and shilling in online technology forums and support by members of the Apple cult.
Mobile phone vendors other than Apple increasingly released mobile phones with non-user-replaceable batteries such as:
- Sony Xperia S and P (early 2012)
- Sony Xperia Z and ZR (early 2013)
- HTC One M7 (early 2013)
- Samsung Galaxy A3, A5, A7 (early 2015)
- Samsung Galaxy S6, S6 Edge (early 2015)[note 1][note 2]
As an outcome, user-replaceable batteries have increasingly been usurped to a point where the vast majority of mobile phones released since 2015 until at least late 2020 have batteries not replaceable by the end user.
The problem: Planned obsolescence
Like defective crucial components in machines, a defective supply of electricity to a device such as an expired battery in a mobile phone cripples its operation.
Over time, with normal usage, a rechargeable battery wears down and eventually loses both capacity and performance. Each charging and discharging cycle adds to the weardown and brings the battery closer to its demise.
On devices powered by Lithium-Ion batteries, the most common battery type in portable electronics, the battery performance's decline usually becomes noticeable after two years of normal usage or one year of heavy usage. Although the battery should have around 80% of its original performance at that point, it means that it is approximately at the middle of its lifespan.
Another noticeable sign of battery degradation is a rashing battery indicator, which falsely makes the device appear to be charging faster due to the battery terminal voltage coming closer to its ceiling faster, while the battery is actually storing less energy
At one point after enough weardown from usage, a battery is weakened by its age so much that the voltage risks falling below a threshold (e.g. 3.0 Volts for mobile phones) during normal operation, unexpectedly causing poweroffs. The battery is considered to be expired and have reached the end of its useful (functional) lifespan at that point.
After further usage of a senescent battery, it will eventually no longer be able to power the device for beyond a few minutes.
Due to the low performance of aged batteries, a device has to artificially limit its processing power to avoid overwhelming the age-weakened battery. Colder environmental temperatures that slow down the chemical reactions inside the battery and lower charging states decrease the output power limit even further.
To prevent this power starvation effect, the device would have to be connected to an external power source such as a wall charger/power supply or a power bank, from where it should be able to draw power in abundance, provided that the power source works as intended. During free movement however, the ergonomy of a mobile phone is restricted while connected to a power bank.
iPhone battery weakness
Battery weakness has especially been a historical problem on iPhones because their batteries had a low capacity to begin with, meaning that the same tasks demand a higher C-rate, which is the battery current relative to its size.
Because smaller and more aged batteries are weaker, powering the same tasks and charging at the same absolute speed induces more stress onto the battery cell due to higher power requiremnts relative to the battery's strength.
Lithium-Ion batteries might suffer from a destructive chemical reaction known as plating if charged during freezing temperatures, discharged below 2.5 volts (usually caused by self-discharging after long non-usage) and trickle-charged.
Over time, Lithium-Ion batteries develope so-called dendrites from normal usage. These are whiskers of lithium that infest the battery internally over time, causing the capacity and performance to degrade over time, and the internal resistance to increase.
Dendrites develope faster at higher charging speeds and at higher temperatures. Too many dendrites could cause an internal short circuit in the battery by drilling through the polarity septum, which is a safety hazard and may pose a risk of fire.
Removal when inflated
In the unlikely event of a mobile phone battery visibly inflating, it can be removed from the device immediately if the rear cover is removable, minimzing damage.
But if a non-replaceable battery visibly inflates, the mobile phone will self-destruct like a Samsung Galaxy Note 7, whose infamous disaster mainly is the result of an aggressively slim design that failed to fit in the squished battery with a moderate capacity of 3500 mAh properly.
The photography capabilities and especially video recording abilities of mobile phones has improved to a point where such devices are able to serve as the main camera to the majority of people.
But mobile phone batteries with less than 10 Watt-hours are considerably too weak to power 2160p (4K) and high frame rate (e.g. 1080p@120fps, 720p@240fps) video recording, thus will degrade quickly when used for powering such tasks.
The usage of video recording modes on newer mobile phones released towards the end of the 2010s decade, with even higher pixel rates, such as 2160p@60fps, 1080p@240fps and continuous 720p@480fps demand even more battery power.
New higher video resolutions such as 3240p 6K and especially 4320p 8K on devices released since 2020, such as the Samsung Galaxy S20 models, ravenously demand battery power and produce significant heat.
Here is a comparison of battery capacities with several known mobile phone models that support at least 2160p 4K video recording at 30fps, as a reference:
Sense of freedom
Knowing that one could easily and quickly replace the battery at any time is a liberating feeling.[note 1]
In contrary, the thought of one trapped (non-modular) component with a short lifespan having the potential to render the entire device near-useless upon expiration could give the user inconvenient subconscious saliency.
- Why it matters.
Due to the tremendous versatility, practicality and portability of mobile phones, these devices have become an essential part of user's lives and are therefore heavily relied upon. It is a digital swiss army knife.
To many, the mobile phone is the most steadily accessible toolbox, electronic companion and digital portal. It is what connects them to the Internet and other people from anywere, captures fleeting moments with its built-in cameras, records stunning footage with its camcorder feature, illuminates the dark when needed with its built-in LED lamp, acts as a digital note book, and much more.
For portability, all of this functionality relies on a portable power source, namely the mobile phone battery. If said mobile phone battery ceases to function properly however, namely because of its old age, its failure disables the normal operation of the device, making all of said functionality unuseable and ineffective.
The battery makes a mobile phone mobile.
Weardown from heavy usage
Fast charging speeds and full, deep charging cycles (i.e. charging a battery up to 100% and discharging down to 0%) reduce the life span of the battery faster.
High charging currents relative to the battery size put enormous stress on the battery cell.
Heavy usage not only heats up the device but also drains the battery faster, speeding up consumption of the limited recharge cycles. This includes:
- Fast charging speeds
- Wireless discharging
- USB-OTG appliances
- High resolution and/or framerate video recording and playback
- 3D gaming
- Mobile video editing
- High display usage
- High screen brightnesses
- High screen resolutions (e.g. 1440p, 2160p)
- High refresh rates (e.g. 90 Hz, 120 Hz)
- Video telephony
- Usage of split-screen and multi-window functionality
- Frequent switching between applications
- Usage of cellular networks like 4G and especially 5G.
- Usage of Miracast (screen mirroring)
- Usage of WiFi direct (file transfer, hotspot FTP server, Internet hotspot)
- Poor signal strengths
Usage as power bank
Mobile phones with USB-OTG (USB on the go) support allow outputting power through the USB port, although with limited discharging speeds and power losses from voltage boost conversion from the mobile phone's internal battery voltage to five volts required for USB power output.
In the late 2010s, the first mobile phones with wireless discharging abilities appeared on the market, such as the Samsung Galaxy S9 (released early 2018) and Samsung flagship phones released since then, of whose this feature has been branded PowerShare. Wireless discharging is also known as “reverse wireless charging” at Huawei.
Wireless discharging allows the mobile phone to act as a wireless charging station and provide wireless power to other devices. If the PowerShare host, the phone providing the wireless power, is not connected to a wired charger itself, entirely the mobile phone's internal non-user-replaceable battery is used to provide the power necessary for wireless discharging.
Criticism of wireless discharging
Although potentially practical in emergency situations, wireless discharging is a ravenous, squanderous waste of the limited recharge cycles of the host device's non-user-replaceable battery due to the inefficiency of wireless power transmission (electromagnetic induction over the air) and the high amounts of transmitted power relative to a mobile phone's battery size.[note 3] The heat caused by said inefficiency (energy loss) adds to the battery's weardown.
Sacrifice of convenience and mobility
In order to extend the battery's life span and to somewhat delay its inevitable demise, one would have to sacrifice convenience by keeping the battery charging state between approximately 25% and 75%, avoid excessive heat (above around ≈30°C), restrict the device's performance by enabling settings for power saving, refrain from extended usage, and deactivate the convenient fast charging feature (or limit charging speed by using less powerful chargers[note 4]), which negatively affects the user experience.
Not only do these measures of frugality decrease user convenience, but they put the manufacturer's implementation of a device's potential capabilites to waste.
In addition, battery nursing measures such as using slower charging speeds and only partial charging cycles would sacrifice the mobile phone's mobility because it would be dependent longer and more frequently on external power input to keep working.
Battery health care measures that involve limiting device performance and used capacity actually simulate an already degraded battery.
With a non-user-replaceable battery, the user is forced to decide between convenience or battery lifespan.
With a replaceable battery in comparison, one can blissfully charge fast, use full charging cycles and do power-intensive tasks such as high-resolution and/or framerate video recording, without bothering with battery care, power saving modes or feelings of guilt knowing that the limited battery lifespan could be a dead-end for the entire device upon expiration, if it were not replaceable.
Some devices, especially dedicated cameras and camcorders, but also many laptops, have an easily accessible battery compartment, which allows the instant replacement of a discharged battery with a charged one, a benefit known from memory cards.
While the device operates on the charged battery, the discharged battery can be recharged using an external charger, to be immediately ready for usage as soon as the other battery is discharged again.
This argument is less of a concern for mobile phones with fast charging technology, because they can be recharged very quickly on the go anyway using powerbanks that support fast charging.
In addition, some mobile phones with replaceable batteries have screw-mounted back covers that need to be opened with the help of a screwdriver instead of only by hand. Such devices include the Samsung Galaxy Xcover outdoor/rugged phone series.
Although such back covers make the battery less accessible on the go, they can provide more reliable and stronger protection against water and dust ingress while still allowing the replacement of an expired battery (that has reached the end of its lifespan) within minutes at home.
Forced replacement (battery surgery)
Phone repair shop
A forced battery replacement of a sealed battery (i.e. battery surgery) by a mobile phone repair shop usually costs at least five times as much as a replacement battery, may take hours instead of less than two minutes, and possibly irreversibly damages the water resistance seal.
In addition, instead of easily manually replacing the battery at home within a minute, one has to trust ones device to a repairman with the hope that he successfully performs the battery surgery without damaging any delicate parts of a device that was never built to ever have its battery replaced.
Such a battery surgery, depending on the build of the device, may rely on high-precision work with a heat gun and with a hot soldering iron in proximity of delicate hardware components, as opposed to risk-freely opening a back cover with ones hand and a screwdriver if necessary.
If internal parts are stuck together using glue, repairs are especially difficult and might cause unintended damage to components.
Manual battery surgery
Although tool kits for performing the battery surgery manually exist (e.g. those by iFixit), the usage of those usually demands intense patience and dexterity (fine motor skills), more or less depending on the device's physical construction.
Services by vendors
Some vendors offer users a servce to deposit their device through (physical) mail for a battery replacement. In that case, the user has to trust that their posted device does not get lost or damaged anywhere in the delivery, and that the vendor does not secretly apply additional unsolicited modifications to the device.
Accessibility of battery surgery
In addition, users located in remote places such as smaller valleys might have to wait days for their device to arrive back at home.
Access to mobile phone repair services tends to be restricted in remote places and during a pandemic outbreak such as Coronavirus 2020.
Replacement batteries however can be purchased by the user any time in advance in any needed quantity.
Anti-replaceable-battery arguments debunked
This section debunks the myths and arguments in favour of non-user-replaceable mobile phone batteries, some of which are applicable to other battery-powered devices as well.
The arguments mentioned in the following list include respective variations of them.
Water irresistance myth
- “User-replaceable batteries make water-resistance impossible!”
A common argument against a design with user-replaceable battery is it allegedly excluding water and dust resistance.
However, devices including the Samsung's Galaxy S5 (including “Active”, “Sport” and “Mini”[note 5] variants), Galaxy S4 Active, Galaxy Xcover series, Sony Xperia V, Sony Ericsson Xperia Active, Cat B15 and B15Q were water-resistant while being equipped with a user-replaceable battery.
- “Replaceable batteries limit water/dust resistance.”
This can be compensated by making the rubber isolation thicker and/or multi-layered.
Slim design argument
- “Users prefer thinner phones!”
Not only is functionality the original purpose of mobile phones, but millions of Apple cult members appear not to be bothered by the >8 millimeters of thickness on all three iPhone 11 variants, the same thickness those hypocrites criticized earlier Samsung mobile phones for.
This iSheepocrisy suggests that the criticism, much of it presumably from Apple iShills and cult members, solely purported for mocking the competing mobile phone vendors.
In addition, the Samsung Galaxy S4 with user-replaceable battery is only 7.9mm thick, which is slimmer than iPhones released in the years towards 2020.
- “Mobile phones with user-replaceable batteries never sold well!”
- “Noone wants a boring polycarbonate back!”
Samsung Galaxy flagship mobile phones of 2010 to 2014 sold tens of millions of times each, making the Galaxy S4 the most sold Android-running mobile phone of all time with more than 80 Million sales.
The millions of members of the Apple cult evidently submit to any design trend Apple throws at them. Had Apple produced an iPhone with user-replaceable battery[note 6], countless members of the Apple cult would have purchased it, solely because of the brand name “Apple”, not its functionality.
Wireless charging argument
- “Wireless charging is not possible with user-replaceable batteries.”
Several devices with user-replaceable batteries such as the Galaxy S3, S4, S5, Note 2, Note 3 and Note 4 allow attaching a special wireless charging back cover that does nearly look identical to the original back cover.
The power is delivered through dedicated contact pins under the back cover.[note 7]
Manufacturers could, if they wanted, include such a back cover into the scope of delivery in the original box in which the main unit is shipped.
- “Non-replaceable batteries are bulkier!”
While they indeed need slightly more physical space for the same capacity due to a need for protective casing necessary for protection during handling and minor drops, that space compromise is one many users would happily accept in return for freedom from planned obsolescence, including 100% of the voters here and the vast majority of voters on a big technology forum. Here is another poll where 100% voted for user-replaceable batteries over bezel-less displays. And an independent poll by Android Authority revealed that the majority of mobile phone users wishes new mobile phones with user-replaceable batteries.
In addition, Page Template:Anchor highlight.css/styles.css has no content.the deterioration of the battery over time nullifies the physical space benefit anyway due to diminishment of the effective battery capacity, thus deterioation of effective energy density.
Many users put their mobile phone in a protective case anyway, defeating the “premium materials” and “sleek design” arguments.
- “…then just go get a phone with user-replaceable battery!”
That mere option (freedom of choice) has sadly been heavily limited since the mid-2010s.
The few new phones released with replaceable batteries are of a low specification class (e.g. mediocre charging speeds, mediocre 1080p@30fps video recording).
Even laptops are increasingly suffering from this restrictive and despicable Apple-made design trend.
Rogue spare parts argument
- “But users might purchase spare parts from questionable vendors!”
In the same way, a user might submit the device to a questionable phone repair shop that might fail to repair the phone properly and add damage in the process.
It is the user's responsibility to purchase spare parts from trustable vendors.
This also applies to other devices and machines such as data storage devices (including MicroSD cards for mobile phones), computers and vehicles, both for spare parts and repairs.
In addition, mobile phone manufacturers could print a notice on the device's package box that encourages users only to purchase spare parts from trustable vendors.
Power bank argument
- “Just use a powerbank/battery case!”
Although it is beneficial and safer to carry a power bank regardless of the mobile phone's battery capacity, this argument appears mainly to be used by the same people who purchase phones and other devices that prioritize form over function, i.e. slim design (a few millimeters thinner) and light weight (a few grams lighter) over battery capacity and those who advocate carrying a power bank that usually weighs multiple times as much as the mobile phone itself, and/or a battery case that adds significant thickness, which is a double standard.
Being connected to a power bank may restrict the device's mobility and ergonomy, especially during camera usage.
If the battery expires, the mobile phone will permanently rely on an external power source to prevent unexpected shutdowns from voltage starvations.
Alleged personal experience
- “My last mobile phone'e battery lasted 3 years without issues!”
Many users however do neither wish to limit themselves to inconvenient slow charging speeds and limit the used capacity range of the battery to between around 25% and ~75%, nor to sacrifice processing speeds using power saving mode, or dismiss functionality of their device that demands much battery power.
Device replacement argument
One is also supposed to purchase a device out of appreciation for its functionality, not because one failing part that is hardly replaceable rendered the entire previous device near-useless and highly dependent on external power input (“wall hugging”).
Many users prefer to keep using their device for well beyond 2 years because it could still fulfill its purpose and get its work done. But that device might not work as intended anymore due to battery failure.
Previous phones could also serve as surrogate/backup devices and/or have some functionality and compatibility that newer devices lack.
In addition, devices with locked bootloaders (which is the default state) have heavy restrictions on data portability.
Battery case argument
- “But what about battery cases?”
Those in favour of non-user-replaceable batteries argue that the existence of battery cases renders user-replaceable internal batteries unnecessary due to the interchangeability of the battery case
Although a creative idea and a useful accessory to many, battery cases are not useable in combination with other phone cases that have special features such as strong protection and an integrated horizontal kickstand.
Lesser common situations
This section addresses situations that are rather unlikely to occur to non-clusmy users.
Those who oppose replaceable batteries argue that software that helps to remotely supervise and potentially find a lost or stolen mobile phone could be rendered ineffective by thieves removing the battery.
However, mobile phones also usually can be forced into power-off with a hard-reset button combination.
In addition, since Android 9 Pie, Google heavily restricted the ability for anti-theft software to remotely monitor a lost device. There is no official user option to manually grant trusted applications such access.
Such restrictions could only be circumvented by manually granting so-called root access to the anti-theft software. Google officially discourages granting root-access to any third-party app. Unofficially however, they actively non-verbally solicit users to root their devices by imposing heavy restrictions onto their operating system in an unmodified state.
Water damage reduction
In case a device with non-replaceable battery that is not water-resistant accidentially gets soaked, the battery can not be removed. Therefore, the battery still provides electricity to the soaked components, which could lead to physical heat damage on the components from short circuits caused by the water.
If the battery is replaceable, it can be quickly removed to reduce or prevent such damage.
This article in a nutshell, with shortcuts to the respective sections for details.
- History: During the 2010s decade, most mobile phone vendors transitioned from user-replaceable to non-replaceable batteries, succumbing to a design trend set by Apple.
- The battery is the single component of mobile phones, laptops and other portable electronic devices with the shortest lifespan, thus technically supposed to be modular and interchangeable.
- Non-replaceable batteries render devices near-useless upon expiration.
- Thus, non-replaceable batteries are planned obsolescence by definition.
- Non-replaceable batteries cause much unnecessary electronic waste.
- Batteries are vulnerable to heat and so-called “plating” that can be caused by trickle charging.
- The so-called dendrites caused by battery weardown are a potential safety hazard.
- User-replaceable batteries provide significant convenience and freedom to users:
- Postponing the inevitable demise of a battery involves frugality (e.g. restricting performance by enabling power saving mode; recording video at lower resolutions and framerates), battery care (e.g. avoiding full charging cycles and fast charging) and thus sacrificing convenience.
- Non-replaceable batteries pose users a dilemma between inconvenience and fast battery death.
- Frugality actually simulates an already degraded battery.
- Mobile phone vendors encourage accelerating battery weardown with wireless discharging, a squanderous waste of the scarce recharging cycles.
- Forced replacements of non-replaceable batteries (battery surgeries) include working in proximity of delicate hardware and could lead to other side effects described in the article.
- Even if one purchases a new device yearly or faster, one's previous devices could still serve as secondary and substitute devices, if not disabled by battery failure.
- A mobile phone can be designed with both water resistance and user-replaceable battery, as has been done in the past already (see this section for example devices).
- The physical space benefit of non-user-replaceable batteries is short-term only due to the battery weardown.
- Did you know?
- The euphemistic term “unibody” is thought to have originated in 2008, as a term coined by guess who.
- On older devices and devices with less sophisticated battery monitoring (such as digital cameras and navigation devices), the battery percentage meter is more prone to miscalibration which is mainly caused by battery aging (loss of capacity; more voltage deflection). Battery meters in newer devices however are less prone to miscalibration due to more sophisticated algorithms for monitoring battery parameters and calculating the battery percentage.
As an experiment, the footer sections of the article (see below) are level-3 (h3) header sections inside one larger level-2 header (h2) section, rather than conventionally separate h2 sections.
Feel free to leave feedback on this format on this article's discussion page.
- On the Galaxy S6 keynote “Samsung Unpacked 2015 – Episode 1”, Justin Denison said on stage:
But in reality, non-replaceable batteries cause the exact contrary: they strongly diminish said confidence.
“You may have noticed a major change here: The battery is built-in[= Hiobsbotschaft]. Now, ~ , we refused to do this for some time[Who asked?]. That's because we didn't want to have a built-in battery until we were absolutely sure that users would feel confident about charging their phones.”
- For their predecessor, the Samsung Galaxy S5, Samsung has proudly advertised its interchangeable battery in their “Wall Hugger” commercial. Just one year later, Samsung has hypocriticized their own advertisement film with the release of the Galaxy S6.
- Charging smaller accessories such as smart watches and wireless earphones (also known as “EarBuds”) demands far less power than other mobile phones.
- One might also limit the charging current by using a longer USB wire with accordingly higher ohmic resistance. This however might not restrict changing speeds on mobile phones that use elevated voltages for fast charging, if connected to a supported charger.
- The USB port of the Galaxy S5 Mini is protected from the inside, meaning that it does not require a flap to cover it externally for water resistance like it does with the standard Galaxy S5 variant.
- Although this is an obvious oxymoron, it just describes a hypothetical situation.
- The Galaxy Note 3, S5 and Note 4 also used such pins for detecting the attachment of S View Cover and LED cover (Note 4 only), while S4, S6 and other Samsung devices detect it entirely through their hall sensor.
- Sony Xperia P promotion video mentioning the euphemistic U-word.
- One-minute film by Sony about Xperia P craftsmanship: “Precision crafted, full-aluminium unibody”
- Samsung Galaxy S5 commercial film: “Wall Hugger” (airport lounge) (2014)
- Top [10 ways] for making your laptop battery last longer (August 5, 2015; original source disputed) (“Contrary to popular belief, laptop batteries are consumables – like printer ink. Batteries aren’t designed to last the lifetime of the laptop, and that’s why – if you check the small print on the warranty statement – you’ll probably find that the battery isn’t covered, or is guaranteed for a shorter period than the laptop.”)
- Cristina Perkins. "How To Increase Laptop Battery Capacity – 7 Amazing Tricks In..." (1984) Available at: Cristina Perkins. "How To Increase Laptop Battery Capacity – 7 Amazing Tricks In..." (Christina Perkins, 1984-07-19) (original source disputed) (“Contrary to popular belief, laptop batteries are consumables, like printer ink.”)
- Laptop battery saver software for Windows 7
- Battery University: BU-808 ─ How to prolong [the lifespan of] Lithium-based batteries.
- Why batteries lose their charge - RAVpower Blog (2017-12-08)
- Typixal Lithium-Ion technical data – IBT Power
- TheGuardian report about poor battery performance of Apple iPhones (2015-09-24)
- “Why smaller batteries have a shorter lifespan — the vicious aging cycle of tiny iPhone batteries.”
- Lithium-ion batteries: Phenomenon of 'lithium plating' during the charging process observed (2014-09-03)
- Strands of lithium are proving to be a nuisance for next-gen batteries – October 20, 2016 by Jeffrey Bausch
- Here’s why the Samsung Galaxy Note 7 batteries caught fire and exploded by Matt Swider (TechRadar, January 23, 2017)
- A list of 15 devices within the feature range of mobile phones. (2017-10-01, original title: “15 Devices That Our Smartphone Has Replaced In Our Lives, Making It A True All-In-One Gadget!”)
- “How to use reverse wireless charging on the Huawei Mate 20 Pro” – Android Authority
- Cat B15 pictures – GSM Arena
- Cat B15 Q pictures – GSM Arena
- A Galaxy S7 after battery surgery does not last 20 seconds underwater.
- “Wie wasserdicht ist das Sony Xperia Z wirklich?” – AndroidPIT Germany – 2013-08-05 (criticism of the design of the 2013 Sony Xperia Z)
- Data Recovery from Botched Battery Replacement — Thread by user BDub-Hay on MacRumors.com on February 25, 2015
- [Help]Botched iPhone battery replacement? — Reddit user td4k on 2020-08-06 in /r/iPhoneRepair (“So I got a new battery for my se and put it in. After a few seconds it turned on and I was able to get to the home screen. But I accidentally knocked it out of the connector as I haven’t finished closing it yet. But after put it back in it won’t turn on again.”)
- Video “Ultimate Samsung Galaxy S5 Water Test!” (2014-04-06) by TechSmartt: Samsung Galaxy S5 successfully surviving water resistance tests: Submerged at 1m (3.3ft) of depth for 1 hour and being washed in a washing machine for 50 minutes
- User-replaceable battery or slim design – Which is more important to you in a mobile phone? – Post #19 by user UTR
- Compare Apple iPhone 11 vs. Apple iPhone 11 Pro vs. Apple iPhone 11 Pro Max – GSMArena.com
- Samsung Galaxy S4 (GT-i9505) – Full phone specifications – GSMArena.com
- "The 20 bestselling mobile phones of all time". The Telegraph. August 6, 2017. Archived from the original on July 15, 2017. Retrieved August 12, 2017. Unknown parameter
- Would you rather have a replaceable battery or slim design? – Linus Tech Tips forums
- Removable batteries: A must-have, or don’t care? (Poll of the Week), January 15, 2020, Jimmy Westenbergm Android Authority
- We asked, you told us: Most of you miss the removable battery – January 18, 2020, Jimmy Westenberg, Android Authority
- “Non-replaceable batteries are necessary” debunked. – Poal.co /s/LostFeatures
- “Non-Replaceable Batteries: This Trend Has to Stop.” (+ Tim Cook investor letter) - Video by Right-to-Repair-advocate Kevin Muldoon
- Criticism of poor data portability with locked bootloader.
- Example phone case with practical built-in kickstand and a design of high robustness and good grip.
- Google restricts background access to camera, microphone and device sensors for alleged privacy protection.
- First known mention of the term “unibody”: MacBook Pro presentation 2008.
- “Non-replaceable batteries: A terrible idea. (The fastest-failing part of a mobile phone has become non-modular.)” (Essay, November 2019, Poal.co)
- Why smaller batteries have a shorter lifespan — the vicious aging cycle of tiny iPhone batteries.
- All new phones (including iPhones) might soon be forced to have a removable battery. – TechRadar.com
- “What are dendrites, and why do they cause fires in lithium batteries?” – ElectronicProducts.com
- “This (!) is precisely why phones without removable batteries are a terrible idea.” (betanews.com, 2015-08-18)
- New EU directive pushes toward replaceable iPhone batteries (2008-10-06)
- “Non-replaceable batteries are necessary” debunked.
- The vast majority of voters prefer replaceable batteries over slim design in mobile phones. – Survey on Linus Tech Tips forums.
- “Federal Environment Agency of Germany calls for sealed battery ban” (2012-11)
- Removable vs non-removable batteries - TechConsumerGuide.com
- Removable vs. non-removable batteries - MakeTechEasier.com
- 5 reasons it's time we stop sacrificing battery life for skinny phones (TheNextWeb, 2016-02-07)
- Criticism of the then new Samsung Galaxy S6 unibody(euphemism) design:
- “iPod's dirty secret” (2003) - Viral film by Casey Neistat criticizing the short lifespan (18 months) of the non-replaceable Apple iPod battery.
- Video of iPhone 6 battery failure situation due to coldness. (German)
- Satirical criticism video by CollegeHumor mentioning unexpected power-offs as a known phenomenon in iPhones.
- WikiBooks article about Lithium-Ion batteries.
- “Why you should buy an Android phone with a removable battery” — by Bertil Hansen (January 2015)