Q: How to charge properly when I receive my Milwaukee M12 battery?
A: There is no need to charge your new Milwaukee M12 battery for 12 hours for the first time use, because lithium-ion battery has no memory effect. So you only need to charge and discharge it normally. What’s more, you should avoid exhausting the battery power and then recharge, because it will bring a lot of damage to your battery. Therefore you have to charge it when remaining power nearly 10-20%.

Q: How to maintain my Milwaukee M12 battery to extend its life?
1 Keep your power tool and battery in a cool dry place (heat may destroy a battery).
2 Complete discharge would damage the life of the battery for power tools.