Replacement Battery for Liftmaster 485LM Battery and 41A6357-1 (1) Battery Works With Liftmaster 3850, 3850P,D900D Craftsman 41B822 Beiter DC Power Beiter DC Power Replacement battery Operates the garage door opener as if the power was still on (all safety and security features still operate) Arrives precharged. Works out of the packaging. Remove terminal protectors before installation. 100% rechargable. Service life of 3-5 years. 12-Month Warranty, 30-Day Money Back Guarantee Stop the beeping now! Order today! Don't pay for a service call, simply unplug old battery and install new battery. It's as simple as that. This Listing is for 1 Battery