Battery Replacement for Chamberlain 4228 Battery for Garage Access Systems Operates the garage door opener as if the power was still on (all safety and security features still operate) 12 Volt 5 Ah for use in Emergency Lighting Rechargeable battery that can be mounted in any position, resists shocks and vibration. Long lasting high performance in high and low temperatures Backed by a 30 day refund policy and full 1 year warranty Sealed Lead Acid (SLA) rechargeable maintenance free battery, UL Lister Battery W/ UR Indicator Dimensions: 3.54 inches x 2.76 inches x 4.21 inches. Terminal: F1. Listing is for the Battery only. No wire harness or mounting accessories included. SLA / AGM spill proof battery has a characteristic of high discharge rate, wide operating temperatures, long service life and deep discharge recover.