I have a Vistalight Nightstick Code 15 but have lost the charger. Does anyone know where I can find one? I have deduced that the battery takes a 7.5 amp charge. It needs a NiMH 600 mah charger. If I can't get hold of the correct charger, I do have an AC charger adapter, but need to know what polarity (+ or -) the nightstick is. If anyone has this information, I'll be set. Thanks.