It’s a common myth that you must charge your rechargeable batteries until they’re completely full and not charge them until they’re empty. That was true for nickel-cadmium batteries, which can suffer from capacity issues when improperly charged. The iPhone uses a lithium ion battery and does not need the same care as nickel-cadmium batteries. Unplugging your iPhone before it’s fully charged does not damage the battery or its capacity. Writer Bio
