The main advice is to prevent complete discharge of the battery iPhone and iPad, which significantly reduces its service life. The optimal battery level is considered to be a value in the range of 40-80%.
Modern batteries have a limited number of full discharge cycles. After that, they begin to lose the manufacturer claims capacity. A full cycle is the process of discharge of the unit from 100% to 0%.
IPhone batteries lose up to 20% of its capacity after 500 cycles of discharge, the battery of the Apple Watch and iPad – after 1000 full recharge cycles. The iPod battery provides up to 80% original capacity after 400 full cycles.
As the experts found out, in order to extend the battery life of mobile devices, you should try to keep the charge level of your device at the level of two third, and more specifically between 80% and 40%. It is not recommended to keep the device charged to 100%.
Not necessarily to charge a new gadget for 72 hours before using it to “remember” what it’s like to be fully charged. It is a myth. This advice fair when working with Nickel batteries, but in the case of lithium-ion batteries used in the iPhone and iPad, it absolutely untenable.
Experts also advise not to expose the iPhone and iPad exposed to extreme cold / high temperatures. The recommended storage temperature for most batteries is 15 °C (59 °F) and the maximum safe temperature generally varies between 40 °C and 50 °C.
At an average temperature of 25 °C lithium-ion battery will lose 20% of its maximum capacity every year. At 40 °C the capacity will annually fall by 35%. Therefore, it is best to avoid wireless chargers: inductive wireless chargers generate heat which makes the battery of your device “toast”.
Too frequent charging of batteries can cause her minor damage. About once a month should still be carried out one full cycle of discharge / charge.