Re-connect the motor unit power cord back into the electrical outlet. Verify that the green LED is flashing on the BBU (indicates that the battery is now charging). Test completed, 2. Charge the battery. Battery will take 24 to 48 hours to fully charge. This opener operates the door open and closed and "learns" the force that is necessary. I understand the force needs to be adjusted depending on the weather, but it has happened a couple of times now in the winter. Parts are lubricated. It is a 1/2 HP belt drive (very quiet). CRAFTSMAN Smart Garage Door Opener InstallationModel# 57918 User Manual: Craftsman 13957918 13957918 CRAFTSMAN GARAGE DOOR OPENER - Manuals and Guides View the owners manual for your CRAFTSMAN GARAGE DOOR OPENER #13957918. Home:Garage Door & Opener Parts:Craftsman Parts:Craftsman GARAGE DOOR OPENER Manual. Open the PDF directly: View PDF . Page Count: 2.