Depends who you ask. To manufacturers it’s a brilliant idea. It’s not a mystery that no electrical engineer knows that Li-Ion batteries don’t like to be fully charged. It’s just that manufacturers realized that charging 100% means you battery will die at around 2 year mark or 600-1000 charge cycles and that will be enough push for some people to buy a new device while at the same time your device seems to last longer on a single charge. Charging to 80% or 85% significantly extends life span of a battery. At that point chemistry almost doesn’t degrade.
And it’s not just with mobile devices and batteries that this is happening. Engineering with a plan to fail at specific time has become a precise science. Making something that will last forever is not that difficult, just not lucrative to them. Take for example LED lights. Manufacturer states 50k hours at 3.1V for white LED. Reduce that voltage down to 2.5V and you have basically made it infinite but it glows less, so to compensate you’d have to add more LEDs and that hits their income. Big Clive has a great video on the subject.
I don’t know, I have a bunch of years old Sony Konion vtc5 and vtc6 18650s, they’re constantly loaded and drained, I guess some have thousands of cycles. Of course, they’re not new anymore, but even my oldest ones, 7 years plus, are ok. They still give 34 ampere for quite some time, so no problems here. Got some even older no-name ones in akku packs, 10 years old, not so many cycles, no problems there either. Maybe because I never charged them quickly and with adaptive voltage?!?
There are 18650 batteries with protection circuit and without. It’s basically over-charge, under-charge and high temperature protection. More info. When charging any battery higher voltage means faster charge and it’s usually not a problem. What is a problem is heat generated. If you can’t dissipate heat fast enough, then you have a potential problem. Slower charging is always safer.
And all charging processes are adaptive voltage to a degree. Say you are charging 18650. Your charger will start with target voltage and constant current at 500mA, and watch the voltage in the battery raise. Once voltage reaches target it will remain constant but charge current will slowly drop. Once there’s no current going in, battery is full at that voltage level. Some chargers will push more current in, some will try higher voltage initially then switch to target voltage. Higher current can be a problem due to chemistry stability and heat but higher voltage should generally be safe. You can even revive some of the old batteries that no longer have any charge by shocking them with higher voltage shortly.
Also, good charger matters a lot.
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For android users, we can easily set notifications if battery level reach certain range by using apps like Tasker. Before this I set it for full charge. Change it to above 80% just now.
EDIT: tasker proj file in case anyone is interested. Link.
Samsung straight up has battery protection option which doesn’t allow it to charge above 85%.
Am assuming it will drip to other manufacturers pretty fast. I think Motorola already has it.
There used to be a magisk module that would charge the battery intelligently and stop before b Full charge but I don’t think it exists anymore sadly, or at least I haven’t been able to find it
I see that features in phones that I’ve used within the past 5 years. Isn’t it a standard feature?
No I’m pretty sure it’s not, I’ve used about 5 different phones on the last 5 years and one iPhone and I’ve never seen it on by default
That is ACC, still alive and kicking. Here is a gui front end for it, you can get it from fdroid or GitHub https://github.com/MatteCarra/AccA
Degraded battery life is rarely the thing that tanks a device for me (sure, it degrades, but it’s rarely the reason I replace it). I mean it’s great to know about this, but the last four phones I’ve replaced have been because (a) my old phone didn’t work on my new network, (b) my camera failed, © my chipset wasn’t up to the task of the most recent OS update, and (d) there was a fundamental flaw in my handset and the manufacturer offered a $50 upgrade to their newer model with trade.
Actually, thinking about it, a and b might be switched, but the point stands: it’s probably been twenty years since battery life was the reason I upgraded (from a flip phone to another flip phone, iirc).
… Aren’t devices designed to only charge the battery to 90% (and report that as 100%), because actually changing a battery to 100% is pretty harmful for it?
You’re thinking of cars, industry and others that have high value batteries.
Power tools, smartphones etc charge to the maximum 4.2V/cell, sometimes even 4.3V (some chemistries safely allow it) because the average person just wants the maximum runtime and will replace the equipment before the battery degrades significantly.
