Will accidentally leaving my iPhone on the charger while I took a nap permanently damage the battery?

michealie wrote:

Will accidentally leaving my iPhone on the charger while I took a nap permanently damage the battery?

As best practice is to leave the phone on the charger overnight, leaving it on the charger while you nap is not going to be a problem.

See this user tip for more information:

When to charge your iPhone or iPad - Apple Community

You can leave it connected for as long as you like. Charging ceases once the battery is at max capacity.

No.

No.