iPhone SE Battery

Replacing A Smartphone Battery
Is your battery draining quickly? Does your battery percentage jump?
These are signs of a worn out battery. All lithium batteries, today's standard battery type in electronics, wear out with time and with use. A drop in capacity can usually be noticed after six months. After 12 months (~300 charge cycles), it's common that the battery has lost 10-30% of its original capacity. Eventually, the battery will fail to keep the phone running stable and the phone could shut down in use or in standby mode.