Is over 15 minutes too long for my iPhone 4 to charge up?

It's been kind of hot and it drained its battery SUPER fast before it died. It's taking forever to charge up and i'm curious to know if it's okay?

It might be doing a battery cycle where it drains all of it's battery and charges up. It helps make the battery life longer

Or it could be charred turn your phone off remove the battery, reinsert it and let it fully charge with the phone off. Then see how long the battery last. If it drains really fast again you might need your battery replaced…

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