Is it bad to charge an iPhone battery to 100%?
It isn’t bad but to preserve battery health one should always charge upto 90% and put it on charge around 20–25%. But every 2–3 months put it on charge after using all the juice. And the myth is that if you charge to 100% your battery health depreciates as charging to 100% is considered as a cycle.
How often should I Charge my iPhone?
The key is not to charge over 80% often and don’t go below 20%. When you charge to 100% it is bad for the battery, it generates a lot of heat and has other battery chemistry degradation when storing a device at 100% charge for prolonged periods. Well the new iOS has a optimized battery management.