This HERCULES™ 20V 12.0 Ah Extreme Performance Lithium-Ion Battery uses 21700 battery cell technology for more power and runtime. Extreme Performance technology ensures that this battery is optimized for high-demand tools in order to power through some of the toughest jobs. Get up to 90% more power*, 145% more runtime** and 140% more cuts per charge***. The easy-view fuel gauge tells you exactly how much power remains before you need to recharge. This is the largest battery in the HERCULES™ 20V system and provides the maximum runtime