The Hyper Tough 20V MAX Lithium-Ion Battery is the perfect upgrade for your Hyper Tough Power Tools. This 20V MAX 2.0Ah battery delivers steady consistent power for a long consistent charge. Lithium-Ion Batteries have a high energy density which provides a longer discharge time and provides consistent power through the charged cycle. Unlike NI-Cad batteries which slow down as energy is depleted, these Lithium-Ion batteries run full strength until all energy is expended. Once charged Lithium-Ion batteries also have a longer shelf life and will not lose power when not in use. Standard 4 to 5 hour chargers and 1 to 3 hour fast chargers are available separately. Hyper Tough power tools and accessories are available for most home and DIY applications. Be sure to see these quality products at a great value for all of your project needs. When you are ready to make repairs or tackle those home improvement projects, Hyper Tough is ready.