The New Hyper Tough 20V MAX Lithium-Ion Battery (AQ90051G) is the perfect upgrade for your Hyper Tough Power Tools. This 20V MAX 2.0Ah lithium battery pack delivers steady consistent power for a long consistent charge and battery life. 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 cordless 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. Please be sure to check out the full line of Hyper Tough products at your local Walmart or on Walmart.com.