PowerStar-Replacement for 485LM Integrated Battery Backup 3850 8360 8550 Garage Opener 12V 5.4AH Sealed Lead Acid Battery with T1 Terminals 3.54in (length), 2.76in (width), 4.13in (height); 3.09lbs 24-Month Warranty, 30-Day Money Back Guarantee Sealed AGM design makes batteries leak free Maintenance free high performance Sealed Lead Acid (SLA) batteries