The Nite Lite 15 Amp Rechargeable Battery fits 5100, 5200 and 5800 headlights and the 4 volt Mine Light. It is spill and leakproof and never needs added acid or water. It comes with a 2 year prorated warranty and gives 12 hours of continuous light. It features a full 15 amp hour rating for 4 volt lights and charges from your regular charger.