Allows for us of 20 V Max batteries in most DeWALT(R) 18 V tools. Adapter requires the use of 20 V Max chargers. Adapter will not fit in DeWALT(R) 18 V chargers. Includes (1) 18 V to 20 V Max adapter, (2) DCB203 Max XR Lithium-Ion batteries (2 Ah) and (1) 12/20 V Max charger.