Powersonic SEC1055 Zeus PC5-12XBEBALT11-Replacement Battery Liftmaster 3850 3850P - 2 Pack Original Power Sonic PS-1250 F1 12V 5AH SLA Battery. Pack of 2 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