Universal Power Group 12V 9AH Battery for Vexilar FLX-28 Pro Pack II Flasher WITH CHARGER UPG # 40812 UB1290 12V 9Ah Dimensions: 5.94 inches x 2.56 inches x 4.06 inches. Weight: 5.17 Lbs SLA/AGM maintenance free, spill proof battery Rechargeable battery that can be mounted in any position, resists shocks and vibration 6 Volt / 12 Volt Sealed Lead Acid Charger