The Genie PBB-BX Garage Door Opener Battery Back Up, part number 39524R, is an OEM Genie accessory that keeps select Genie DC motor openers operating when utility power is lost. Designed for residential use, this backup power module automatically charges while AC power is available and switches to battery power during an outage so you can safely open and close the garage door. It is intended for Genie openers that are specifically battery‑backup‑ready and provide a dedicated BBU connection; it is not universal. Check your opener’s model and manual to confirm compatibility with PBB-BX/39524R.
This replacement/upgrade unit installs near the opener head using the included mounting provisions and low-voltage harness, typically requiring no programming. After installation, allow a full initial charge before testing by temporarily disconnecting AC power. Operation on backup power is limited and can vary based on door weight, balance, temperature, and usage; opener speed and lighting may be reduced to conserve power. Use only with properly installed and balanced doors and functional safety reversing sensors in accordance with UL 325. Periodically test and maintain the backup per Genie’s instructions, and replace the unit when it no longer holds adequate charge. Common search terms: Genie battery backup, Genie 39524R, PBB-BX, garage door opener battery, OEM replacement, backup power module for residential Genie openers.