I wasn't able to unscrew the blue ones. My PH0 bit was a bit overused but still, I've never seen small screws that would lock up in the middle of the thread like these ones.

JustHandguns, you claimed that 1% capacity may be actually 20% capacity to prevent over-discharge. That really complicates things and doesn't help people understand it.

0% state of charge in a smartphone's Li-Ion battery is between 3V and 3.3V depending on the device. 100% is between 4.2V and 4.4V. It's not like 0% is 0V, that's the misconception causing the myth that it's bad to drain batteries fully.

80% is only approximate and 20% is a myth. 80% is still much higher than the safe limit of 3.94V according to Accubattery (ideally, you'd stop charging around 70%) and there's no evidence that discharging to 0% is harmful.

What's definitely harmful to lithium chemistry is a) keeping batteries fully charged and b) literally charging them.

I wouldn't jump to conclusions. Different factories have different manufacturing technology and there's a high chance that a genuine battery has better quality than a 3rd-party one.

However original batteries are often older than a 3rd party. A few years ago I bought an "original" battery for a Galaxy Note 4 (2011) and it had 50% health - because it had been produced around 10 years earlier. Then I bought a 3rd-party battery and it had 75% health - the best you can get nowadays because they're still past production date. Unfortunately, 3rd party manufacturers don't mention the date of manufacture so I can't tell when that battery was made (but Samsung does mention it).

Keeping batteries at 0% is safe if they're not being drained further below 0% (when the device is off). But it's better to keep them at 3.7V, whatever that is in percentage terms, as they're stable at 3.7V (or 3.85V for newer ones, I guess).

In my opinion, 2 full "overcharge" cycles wouldn't reduce perfect health by 2.5%, as a battery lasts thousands of cycles. That seems like a measurement error. But I've seen a test with car batteries where they measured each capacity drop after each full charge consistently (measuring on discharge). At least car batteries are that sensitive to full cycles.

Stop multiplying the myth and lie of "don't discharge lithium batteries". You said we should charge batteries even at 50% and never discharge them fully. Do you have ANY proof of that whatsoever? Why don't you mention overcharging? Do you know what voltage the battery has when charging?

The claim that it's bad to discharge a lithium battery to 0% is a myth and here's proof: 0% is around 3V or higher. Lithium batteries shouldn't be discharged below 2-2.5V volts (you'll find sources for this) but the percentage doesn't matter. Similarly, it's not having batteries fully charged that harms them, but keeping them at a high voltage (above ~4V for lithium-ion). If you're discharging a battery from 100%, the voltage isn't as high as on stand-by. If you're keeping it at 100% (overnight or with the screen off), that's actually bad. If the battery is being charged above 70-80% that's also bad because the voltage is also very high (up to 4.4V, same as fully charged).

Nope. I'll have to update this guide. The top and bottom required exactly 11mm of cutting (measured correctly from the glass's edge to the speaker glue's edge), while the guide said 9mm. Cutting 9mm didn't cut enough of the speaker adhesive to even allow forcefully prying it open with the use of a heat gun. If you only cut for 9mm, you'll break it. Also, the bottom ribbon begins at 11.5mm (better get a thin cutting tool with a measure) and the top has no ribbon, giving you 16.5mm of leeway (and you only need 11mm). I don't know who wrote this guide but it's wrong. Also, you won't damage the forward-facing camera, as it has a plastic frame all around. Furthermore, I was unlucky enough to find out that the display was glued to the midframe, making it physically impossible to safely separate it.

Don't forget to unplug 2 connectors next to the drive's connector. They're not mentioned anywhere in the guide but you won't remove the motherboard with them.

You forgot about the screw that secures the motherboard on the bottom left. It's in the photo.