Avoid High Temperatures
In terms of lithium-ion batteries, few things are as destructive as heat. Leaving your phone near heat sources degrades the battery quickly. Leaving the device in direct sunlight is also discouraged for the same battery-related reasons, but there is also the screen to consider.
Modern phones have high-quality screens, but even those cannot withstand the harmful effects of sunlight. The screen might become discolored or faded due to the sun. Replacing the screen on your phone is no simple task, nor an inexpensive one. Most people find it easier to just replace the phone when they are faced with screen repairs.
Avoid Cold Temperatures
Batteries need more power in order to keep themselves functional, so exposure to cold temperatures is harmful to the battery’s longevity. You have probably noticed that when exposed to perpetually cold temperatures, battery charge decreases far more quickly. You can certainly still use your phone in the cold, but when not used make sure that it is located in a relatively well-insulated place, like the pockets of your jacket.