today i buyed the black diamond's icon headlamp (nice bright shining). black diamond offers also an compatible 3.6 volt nimh accumulator pack (unknown capacity in mAh...) with a charger. i assume it's only a simple ac/dc converter with a fix output voltage, the charger electronics is integrated in the headlamp battery case. do anyone know's the output voltage of the original dc supply from black diamond ? i think about an home-made-nrg kit....