Load up the device, plug into the wall, and get fully loaded battery power when you need it. Should you insert a bad or primary battery, the screen pulses to notify you. 2 x AA, 4 x AAA. Delta V features shuts off charging to protect your batteries from overcharging.

EAN: 7638900323252
Brand: Energizer
Compatible Battery Sizes: AAA
Type: Rechargable Battery
Battery Capacity: 4
MPN: 633151
Chemical Composition: NiMH