The RYOBI 40V 8Ah Lithium Battery features premium 21700 cells that when combined with INTELLICELL™ technology delivers up to 40% more power and up to 6X more runtime increasing overall efficiency. The COOL-CORE PRO™ heat management system utilizes upgraded heat sinks to reduce temperature while in use. This will optimize performance, allowing the battery to run 30% cooler, live 50% longer and deliver fade-free power in all conditions. The robust design and anti-vibration technology increases durability and enhances user experience during demanding applications. The high visibility LED fuel gauge clearly indicates remaining runtime. Easily install and remove the battery with the secure quick-release button. Best of all, it is part of the RYOBI 40V system. This 40V 12Ah Lithium Battery is backed by the RYOBI 5-year manufacturer’s warranty and includes (1) OP4012A1 40V 12Ah Lithium Battery and Operator's Manual. Charger sold separately.