Does leaving your iPhone 4 charged after it gets to 100% bad?
I heard that if you leave your iPhone or Ipod charging after it charges 100% that it will drain/kill the battery and make the battery life shorter. Is this true?
Yes. Over charging anything that needs to be charger kills the battery. Not just phones.
I heard it could damage the battery.
Overcharging is a thing if the long past. Even NiCad batteries from the 1990s didn't actually overcharge, but would be damaged from excessive heat from constant cycling of current.
Same thing applies today; you can't overcharge a battery, but constant power can cause a lot of heat, which can damage the battery or the phone itself.
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