Lithium polymer battery

[Mooncatt]

Lol, didn't realise people micro managed their batteries this much.

I generally discharge mine down to 2%, then plug it in to take it to 100. Always done this, while avoiding incomplete 'boost' charges.

It wasn't much of an issue in the past. If your battery degraded, you simply popped in a new one that cost $20 or less. With so many phones going to sealed batteries, you're looking at a lot higher replacement cost, plus additional down time if you want it replaced. Or simply accept that it'll start shutting down on you at 10%, 20%, 30%, etc. That's why you see more and more people taking better care of their batteries, so they aren't replacing them so often.

 

[Rukbat]

A lot of people (including me) have done a lot of testing, and the longest life seems to come from about charge to 80%, then recharge when it falls to 40%. That shouldn't cause the battery to get too hot. (Charging to 100% causes heat near the end of the charge - add the discharge heating to that and it can be bad for the battery.)

As for "waking up", if you install Magisk (even if you don't need root) and Magisk Charging Switch, you can set it to 80 40, so the charging stops at 80%, and doesn't start again until the battery falls to 40% (unless you unplug the charger after it's charged, then plug it in later). So no worry about the battery charging over 80%. Install GSam and set the alarms to 81% high and 39% low and the phone will tell you when to charge and when to disconnect.

Why do the manufacturers tell you to go from 100% to 20%? Replacing a battery is a high-profit job. Even if they only charge you $60 (about 47£), that's a $5 (4£) battery and the rest is profit. I'm surprised they don't advise letting it discharge to 0 - that would mean a battery replacement every month or so. (Plus a week or two without the phone each time.)

(The battery in my V551 - from 2004 - is still almost fully operational. That's 14 years. the phone's useless now, but the battery outlasted the phone.)

 

[JZ VR]

Lol, didn't realise people micro managed their batteries this much.

I generally discharge mine down to 2%, then plug it in to take it to 100. Always done this, while avoiding incomplete 'boost' charges.

I think it's bad to wear it below 20%, little boost charges are apparently actually good for the battery (unless you're boost charging after 100%). Newer batteries work differently.

 

[GSX1400]

A lot of people (including me) have done a lot of testing, and the longest life seems to come from about charge to 80%, then recharge when it falls to 40%.

Interesting views guys, thanks!

So, currently I get over 2 days from my P20 Pro by charging from 0% to 100. You guys reckon that if I charged from 40% to 80%, this would improve further? May be worthy of a test.

 

[Mooncatt]

Interesting views guys, thanks!

So, currently I get over 2 days from my P20 Pro by charging from 0% to 100. You guys reckon that if I charged from 40% to 80%, this would improve further? May be worthy of a test.

You won't get 2 days out of a single 40-80% charge, but you will get longer overall life before it's time to replace the battery.

 

[Visc]

How long would it take for you to lose 60% of the battery capacity? If we are limiting our giant battery to 40%, seems like it would be better to just let it ride unless you kept your phone for years.

 

[Fred98TJ]

60% capacity ? Why did you come up with that?
Lithium batteries are considered eol when they decrease to 80% capacity.

 

[Mooncatt]

How long would it take for you to lose 60% of the battery capacity? If we are limiting our giant battery to 40%, seems like it would be better to just let it ride unless you kept your phone for years.

This article has tons of info, but in general, "it depends."

https://batteryuniversity.com/index.php/learn/article/how_to_prolong_lithium_based_batteries