Powersonic 6V 4.5Ah PS-640, PS640F1, UB645 Replacement SLA Battery NEW! - 4 Pack Original Power Sonic PS-640 F1 6V 4.5AH SLA Battery. Pack of 4 Dimensions: (L) 2.76 x (W) 1.86 x (H) 4.25. Weight: 1.60 lbs. SLA/AGM maintenance free, spill proof battery Rechargeable battery that can be mounted in any position, resists shocks and vibration 1 Year Warranty