iPhone 6s Plus always plugged in, bad for battery?

[HEK]

Whenever I get a new iPhone, I like to charge it full then drain it full to 0% at least 4-5 times to help push the longevity. Then I only plug it in at nights. Sometime if I knew the next day I would be home most of day (weekends), I don't plug it in at all. At end, The battery give me more than a day for over a year.

These are not nickel cadmium or metal hydride batteries. Running from 0 to 100% does absolutely nothing to increase longevity in Li ion batteries. Totally different chemistry. At most doing the full cycle every 3 months or so helps reset the software read out on percentage meter. This is a software setting that calibrates itself to whatever the battery capacity is.

 

[C DM]

With all that said, Li-ion batteries like to be used, so it's better for them to be used more than not--it doesn't really mean getting completely used up all the time (although doing that here and there is fine too), but it does mean that it's better when the battery gets used up some rather than always being full or empty or even at some other constant level of charge (although, again, it's fine for it to be like that at various times, just not as good if it's like that all or most of the time).

 

[darrylcn]

I should probably adjust my usage patterns then I guess. I feel like I'm on the verge of overthinking this stuff but I'll give it a whirl for a while if the mood strikes.

 

[Vundu]

It won't do it any good to leave it constantly connected though, because although the battery has an overcharge failsafe you're still constantly topping it off. It will slowly eat into your charge cycles.

It would use more cycles running off it though to top up the battery again.