[L473ncy]

I would charge for 2 hours and a little bit (2 hours and 5 min maybe) just because you don't get 100% efficiency in the power transmission when charging. That's actually why the battery heats up.

Think about it this way, when something is rubbed along another surface it heats up because of friction, that friction is essentially "inefficiency" that causes you to need to do slightly more work.

Also I would grab myself a smartcharger if I were you.