About this replacement
Uniden Guardian G955 / UDR744HD Series — 3.7V Li-Polymer Replacement Battery (634169)
This 3.7V, 2000mAh (7.4Wh) Li-Polymer battery replaces OEM part 634169 in the Uniden Guardian G955, Guardian UDR, UDR744, and UDR744HD wireless security cameras. When the original cell degrades, motion recording becomes unreliable and the camera drops offline. This replacement restores normal operation without replacing the entire unit.
- Guardian G955 and UDR series compatibility: These models share the same 3.7V battery rail, connector pinout, and BMS handshake protocol — the 634169 cell seats and communicates identically across the G955, UDR, UDR744, and UDR744HD platforms.
- Bench tested on actual hardware: We cycled this cell through simulated motion-trigger events, monitoring BMS cutoff behaviour during the combined IR LED and processor current spikes that occur at each trigger. The cell held voltage without tripping cutoff under back-to-back trigger loads.
- First-install power cycle: After fitting this battery, power cycle the camera once through the Uniden app. The firmware must register the new cell before motion events log correctly to cloud storage — skipping this step can cause missed recordings even when the camera appears online.
Why the Guardian G955 goes offline in the app after a battery swap
Replacing the battery clears the camera's active session token. The app loses the authenticated connection and marks the device offline even though the hardware is powered. This is a firmware state issue, not a fault with the battery or the camera. Open the Uniden app, remove the device from your device list, then re-add it using the original pairing steps to restore the live feed.
App reporting 0% or incorrect battery percentage after installing this cell
The Guardian series uses a voltage-threshold indicator — it reads cell voltage and maps it to a percentage, it does not use a fuel gauge IC. A new Li-Polymer cell at rest sits near full charge but the firmware's threshold map may not align until the cell completes one full charge-discharge cycle. Run the camera normally until the low-battery alert triggers, then charge to full. After that first full cycle, the percentage display will track accurately.