Note: Only Compatible with drill ACD136 series & ACD138; Impact wrench ACIW301; Impact screwdriver ACIS181 Not compatible with other AVID POWER's 20V tool. Not Compatible with any machines from Dewalt, BLACK+DECKER, CRAFTSMAN, RYOBI, WORKPRO, Milwaukee, Makita, Bosch and so on The 1.5 Ah rechargeable Li-ion battery is lasts longer than other batteries; Built-in overcharged and overheat system protects the battery; Lithium ion technology means more efficiency and no memory effect. Fully charged in 3-5 hours; NOTE: Charger is not included; Each Avid Power battery is thoroughly inspected and tested before leaving the factory In order to extend the battery life, fully charge it after each use and ensure that it is charged every three months; avoid storing batteries in cold places as low temperatures may cause them to fail Avid Power 20V Max 1500mAh Lithium Ion batteries have been formulated for longer run time and improved performance. Batteries are only compatible with Avid Power 20V cordless power Drill-ACD136 series & ACD138; Impact wrench ACIW301; Impact screwdriver ACIS181