Neptune NT 485LM is a direct replacement for the Liftmaster 485LM battery. Used as a Liftmaster and Chamberlain garage door opener battery backup which allows for use when power is out, helping prevent lock-outs. Absorbant Glass Mat (AGM) technology for superior performance. Valve regulated, spill proof construction allows safe operation in any position. Easy day- battery replacement instructions 1. Disconnect power to opener. 2. Using a Philips head screwdriver, remove the battery cover on the motor unit. 3. Remove old battery and discard. 4. Partially insert new battery into motor unit with terminals facing out. 5. Connect red (+) and black (-) wires from motor unit to corresponding terminals on battery. 6. Replace battery cover. 7. Reconnect power. 2-years warranty Manufacturer warranty covers any qualitey realted issues, customer is responsible for shipping to and from the warranty facility. After 30 days only a replacement will be provided. Direct Replacement For: 804302, 23-289, 23-289B, 23-289A, 23289, BP4-12, BP4.5-12, BP5-12, CA1240, CFM12V4.6M, DG12-5, ES4-12, GP1245, GP1250, HR5.5-12, HR1221WF2, JC1240, LC-R125P, LC-RB124P, LC-R125P, LCR-12V4BP, LCR-12V5P, NP4-12, NP4-12P, NPH5-12, NPX-25, PC1250, PE4-12R, PE4.5-12R, PE12V4.5F1, PE12V4.0, PS-1242, PS-1250, PS1250, PS-1252, PXL12050, RBC45, SLA-12V4-5, UB1245, UB1250, UB1250A, WP4-12, WP4.5-12, WP5-13