This HERCULES™ 20V 8.0 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 35% more power*, 60% more runtime** and 50% more cuts per charge*** than the standard Hercules 5.0 Ah pack. The easy-view fuel gauge tells you exactly how much power remains before you need to recharge.