Product Description The Chamberlain Replacement Garage Door Opener Battery recharges for up to 20 cycles without grid power. Allow you to get in when the power goes out. It is compatible with Chamberlain battery backup garage door openers. From the Manufacturer Replacement battery for the Chamberlain WD962KD Premium Whisper Drive Plus Garage Access System with EverCharge Standby Power System. This is a Hazmat item and cannot be returned.