Originally Posted by qwertymac93
I want Qualcomm(or anybody, really) to implement an advanced charging system that isn't JUST about speed.
I would really like this too. I should be able to set my phone to slow charge most of the time, I rarely need a quick charge. Quick charging is great when I do need it but most of the time my phone gets over 8h solid on the charger every night, or at least every time it gets any charging.
While new ones take much less damage when being charged quickly even the best batteries take more damage the faster they are charged, down to a very low charge rate. Of course, device longevity is not a major concern for the manufactures. A phone designed to last even five years would be amazing.
Originally Posted by JackCY
That is a very classic example of overcharged. I think the reason old ones do it is because a bad charger tries to charge it up too much, because it cannot tell it is old enough that it cannot be charged that much anymore. Or getting too hot a some point.
When LiPOs were new I remember early LiPO chargers where you had to unplug the batteries in time or they would swell up until they sprayed fire. Always charge your batteries in a metal pan and avoid the smoke if one goes off. Those were not great chargers. Still, for RC airplanes LiPOs were a big enough upgrade to be worth the fire hazard. Crashes got more interesting too. LiPOs are as safe and reliable as they are due to fairly sophisticated battery state monitoring and protection circuits, and of course these circuits never have any bugs.
They also do that if discharged too fast, since that makes them get too hot.
Originally Posted by JackCY
Why does one need a chargie? Don't modern smartphones come with a limit of how much you want to charge them? Say to 80 or 90% max?
I don't think so? Not my S10+ anyway...
But I don't know if this is a good idea anyway. The reason to limit the max is to prevent the max from decreasing overtime, so after 1000 charges it is down to 80% instead of 70% or so... but if you are limited to 80% from day one you are functionally pre-damaging it to prevent damage. It would take some good data and math to figure out a reasonable limit where you actually had more battery life over the entire life of the phone. You would need to slowly raise the max capacity you charged to for it to work out. I am not even sure it would work out, it isn't like even only charging between 40 and 60% causes no damage. It is probably better to worry about the other end more, get worried about power at 25% instead of 15% and try to always keep it above 20%. That way if you need it unexpectedly you do have it while still treating the battery better than always running it down completely. The low end hurts a lot too, perhaps even more.
I don't charge it if it is still above 80%, at least much of the time, but as far as the battery chemistry is concerned they already aren't at true 100% capacity. The manufacture picks what 100% means, they usually push capacity a bit but not too much on the wear/capacity curve. Usually you are already in the flatter section of the curve when reducing max capacity so you don't gain that much. Of course, it does depend, usually isn't always.