Allows for use of 20V MAX batteries in most DeWalt 18V tools. Adapter requires the use of 20V MAX chargers. Adapter will not fit in DeWalt 18V chargers. Adapter will not work with 20V/60V Flexvolt batteries. Do not use with premium batteries (DCB200, DCB204, DCB204BT, DCB205) in 18V compact drills DC970, DC759 (use DCB201, DCB203, DCB203BT). Adapter will not work with 20V/60V Flexvolt batteries. Combo kit includes 18V-20V MAX adapter, 12V/20V MAX charger, (2) DCB203 20V MAX XR lithium-ion batteries (2.0 Ah).