Just a little tip with batteries.

Don't charge them overnight.

You'll kill them pretty quickly if you leave them on the charger all night.
You are better off to take the battery off the charger when or just a little while after the charger tells you it is fully charged.

Same goes for phones or any other chargeable battery.
Trying to pump more charge into them than they are designed to take will damage the cells even though when fully charged, the charger reverts to trickle charging them.