I have experienced it on multiple mobile phones and my laptop. If i charge the battery to 100% the discharge to 99% is way slower than if i charge the battery to 90% and discharge to 89%. And this makes me charge the battery to 100% even when I know that it is bad for the battery just because the charge lasts much longer than charging to 90 or 80%. Is it related to some kind of chemistry?
I am ok with eli 20 also. Thanks.
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There is actually a lot to this question and kind of need to explain several things like measuring battery charge, battery health, and good old ohms law. But essentially, at full charge your battery is able to put out its full voltage, however this voltage drops during discharge. As voltage drops, current (amperes) must be increased which In turn uses more battery faster.
Now more importantly, stop fully charging your phone. You might think it’s better because you get a little bit more use time out of it but you’re screwing yourself over. Battery charge is estimated from how much voltage it’s giving out. Fully charging a lithium battery permanently damages the chemistry inside the battery and will impact the total voltage the battery can produce. It’s only a tiny amount each time, but it adds up eventually. Battery wear indicates the loss of maximum voltage the battery can produce, which means it needs to use more amperes to operate which in turn gives you less overall battery life.
The problem with phones then cascades. As newer and newer phones are made, they demand higher CPU power (voltage) to operate properly. If you have a phone that’s a year or two old and you haven’t treated the battery nicely, you will find that your phone struggles because the maximum voltage it can put out isn’t good enough to keep the CPU operating at a high frequency. People refer to this as phone manufacturers purposely bricking their phones with software updates to force them to upgrade. It’s not. It’s people misusing their phones and after that 1 – 2 year mark when battery wear becomes a problem, their phone starts sucking.
My current, and last two smart phones have always lasted me at least 5 years of great performance. I hate this idea of upgrading phones every plan cycle, it’s horrible for the environmental and completely unnecessary. You’re just feeling Apple money for no reason. I currently have a pixel 4 (and it’s still fast and I have zero issues with it), it’s exactly two years old at this point. I use an app to manage my battery and it currently reports my battery wear as 94%. This means in those two years I’ve only lost 6% of my battery capacity. I’d guess for people who charge their phones a lot they would have at least double that in two years, maybe more. The more you look after your battery, the longer your phone lasts
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