This 2 pack of V20* 4.0Ah Lithium Ion Batteries provides up to 3x the capacity versus the standard of a standard 20V MAX* lithium battery*. They are compatible with the CRAFTSMAN® V20* cordless power tool and outdoor tool lineup. The professional grade high performance cells provide improved power and a longer cycle life. Each pack is equipped with a 3-LED state of charge for immediate battery charge feedback. No memory and virtually no self-discharge means this battery is ready when you are.