Powersonic 12V 5Ah Replacement for Chamberlain 41A6357-1 Garage Door Opener 4228 Original Power Sonic PS-1250 F1 12V 5AH SLA Battery. Dimensions: (L) 3.54 x (W) 2.76 x (H) 4.21. Weight: 3.50 lbs. SLA/AGM maintenance free, spill proof battery Rechargeable battery that can be mounted in any position, resists shocks and vibration 1 Year Warranty