The RYOBI 40V 4Ah Lithium HIGH PERFORMANCE EDGE Battery utilizes tabless cell technology to deliver more power and longer runtime, while running cooler and providing extended battery life. This 4Ah battery features 21700 tabless cells that when combined with INTELLICELL™ battery technology delivers up to 2X more power & 4X longer runtime maximizing performance in demanding applications. The COOL-CORE PRO™ heat management system uses upgraded heat sinks to reduce the battery temperature while in use. This improved energy transfer optimizes performance, allowing the battery to run 25% cooler and live 50% longer. With a cooler temperature, this allows for the best battery and tool performance; and reduced downtime while charging, getting you back to work faster. Achieve up to 47% more power cutting yellow pine when using the 40V HP Brushless 18” Chainsaw vs a standard 4Ah battery. The robust design and anti-vibration technology increases durability and protection against everyday wear and tear, enhancing user experience. The high visibility LED fuel gauge clearly indicates remaining runtime. Easily install and remove the battery with the secure quick-release button. Pair this RYOBI 40V Lithium HIGH PERFORMANCE EDGE battery with any RYOBI 40V HP Brushless tool for more power, longer runtime and the best overall experience. Best of all, it is part of the RYOBI 40V system, and works with any 40V product. This 40V 4Ah Lithium HIGH PERFORMANCE EDGE Battery is backed by the RYOBI 3-year manufacturer’s warranty and includes (1) OP40406TA 40V 4Ah Lithium Battery and Operator's Manual. Charger sold separately.