Universal Power Group BATTERY REPL TOYO 2FM4.5, 4V,4.5AH,RECHARGEABLE UPG # 40559 UB445 4V 4.5Ah Dimensions: 1.86 inches x 1.87 inches x 3.98 inches. Weight: 1.10 Lbs SLA/AGM maintenance free, spill proof battery Rechargeable battery that can be mounted in any position, resists shocks and vibration 1 Year Warranty