The DEWALT DCB609-2 20V/60V max* flexvolt 9.0Ah battery 2PK features 180 Watt hours of energy in each battery pack, and 6x the runtime compared to DCB201 1.5Ah battery. It offers 9.0 Ah capacity when used in a 20V max* tool. This battery also has a LED state of charge display so you can always know your battery remaining run time. This battery is compatible with all 20V max*, 60V max* and 120V max* tools – and also compatible with all 20V max* chargers.