This V20* 4.0Ah Lithium Ion Battery pack provides up to 3x the capacity versus the standard of a standard 20V MAX* lithium battery. It is 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 CRAFTSMAN? 20V MAX* battery is ready when you are.