Battery gets real hot while charging

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Keeping iPhone, iPad, and iPod touch within acceptable operating temperatures

Good luck.

Define "real hot?"

If you're using a faster charger, such as a 20W brick, the battery should be warm. Batteries while being charged heat up naturally. iPhone has circuitry built in to avoid overhearing situations. If you are not seeing a message suggesting your phone needs to cool down, it's likely operating within normal parameters.