Craftsman Professional Lithium 12 V battery features SmartChip® technology, which maximizes the efficiency and lifetime of the battery by monitoring and protecting against extreme temperature, over-charge and over discharge. The Craftsman Lithium battery lasts over 2000 recharges, weighs 25% less than NiCd batteries and has fade free power output. An integrated 4-LED Power Bar displays battery charge so you'll always know how much power remains. The power bar flashes when charge is running low to visually alert you when the battery needs to be recharged. Also features anti-skid overmold protection. Wt. 1.2 lbs.