MilWalt Battery Adapter
3 amp maximum (if you need to power something more than 3 amps, use a relay)
This adapter fits both Milwaukee and DeWalt style batteries
On the underside of the adapter is a small "blinker board" (low voltage cutoff) to protect the battery from over discharge. More information on the Blinker Board here.
Includes: 1 adapter with BB board
Milwaukee M18 style tool battery
DeWalt style 20v tool battery
Battery not included