The C-251 battery charger is for use with the Wolflite H-251 Mk1, which requires the battery pack to be removed to recharge.
The battery is simply slotted into the C-251 and secured in place with the latch plate.
The C-251 is for use at mains voltages of 230 volts or 110 volts, selectable by voltage changeover switch.
Compatible Handlamp :
H-251 Mk1 / H-251 Mk2 / H-251A / H-251E