Hawk-Woods AD-NP1 Converter Box This handy converter can be used to adapt the output from an NP1 charger to either a BP-90 socket (2.1mm) or a 4 pin XLR male. Using this converter with a Hawk-Woods NP1 distribution adapter a BP-90 type battery can be used as an alternative power source. A 12V power supply can be connected via the 4 pin XLR eliminating batteries completely when mains is available.