GERIT BATT 18V 9.0Ah Replacement Battery for Milwaukee M18 Demand Battery Pack 48-11-1890 Cordless Power Tools Do Keep Battery Cool and Dry : Cordless tool batteries will last longer if stored in a dry, climate controlled dry area. Do Charge Battery Completely: Be sure to leave the cordless tool battery plugged in until it&#039;s completely charged. Do Use Battery Regularly: Battery life decreases with lack of use, so keep those tools in action! Do Store Battery Properly : Store your cordless tool battery in the original carrying case, or in a cushioned bag. Do Protect the Battery: Be gentle with cordless tool batteries  they won&#039;t work if damaged or cracked. Do Keep Battery Charged : Recharge cordless tool batteries as soon as  you notice a decrease in power. Most batteries last longest if recharged  when they reach 70% capacity.