This RYOBI 18V ONE+ Lithium-Ion 4.0 Ah Battery (2-Pack) and Charger Kit provides up to 3X more runtime compared to standard 18V lithium-ion batteries. These batteries are compatible with over 225 18V ONE+ tools to power through all types of projects. Built with professional grade lithium-ion cells these batteries provide fade free, cord-like power. They are engineered to perform in extreme weather temperatures and are engineered to be impact resistant. They also feature an integrated LED fuel gauge for charge monitoring. The included charger is compatible with all RYOBI 18V ONE+ Lithium-Ion Batteries. Best of all, it’s a part of the RYOBI ONE+ System of over 225 Cordless Tools that all work on the same battery.