Recharging at 40% is a great threshold for Lithium-Ion batteries.
Other battery chemistry’s vary in how far they should be discharged for optimal performance but fully discharging is not good for any battery.
Is it bad to charge your phone at 50 percent?
If you’re storing your phone unused for an extended amount of time, it is advisable to keep the battery charged at 50 percent before turning it off for storage. For even longer periods, they recommend turning on the phone every six months or so and plugging it in to charge it back to 50 percent.
At what percentage should I charge my phone?
When should I charge my phone? The golden rule is to keep your battery topped up somewhere between 50- and 90% most of the time. So top it up when it drops below 50%, but unplug it before it hits 100%.
Is it okay to not fully charge my phone?
Don’t keep it plugged in when it’s fully charged
According to Battery University, leaving your phone plugged in when it’s fully charged, like you might overnight, is bad for the battery in the long run.
At what percentage should I charge my iPhone?
Apple recommends, as do many others, that you try to keep an iPhone battery between 40 and 80 percent charged. Topping up to 100 percent isn’t optimal, although it won’t necessarily damage your battery, but letting it regularly run down to 0 percent can prematurely lead to a battery’s demise.