Allows you to still come & go through your garage door, when the power goes out. Liftmaster 485 lm battery backup system - chamberlain part number 4228- 100% oem new production dates- liftmaster factory supplied also works with sears and home depot garage door battery back ups- replacement part compatibility for all battery back up units with slide in battery - 3850/8550 and new models.
Liftmaster 485lm Replacement Battery-
*Interstate : 12V 5AH SLA DEEP CYCLE 250
Also works with Sears and Home Depot Garage Door Battery Back Ups- Replacement Part
Compatibility for all battery back up units with slide in battery - 3850/8550 and New Models