Garmin DashCam 25 Replacement Battery 3.7V 750mAh

Garmin DashCam 25 — 3.7V Li-Polymer Replacement Battery (361-00025-01)

This 3.7V, 750mAh Li-Polymer cell replaces the internal battery in the Garmin DashCam 25. It restores the camera's ability to power on with the engine, maintain parking mode recording between drives, and write footage cleanly to the card. Capacity is 2.78Wh — matched to the OEM specification.

• DashCam 25 internal cell: The DashCam 25 uses a slim Li-Polymer cell — 49.10 × 30.00 × 5.50mm — to buffer power between the vehicle's 12V feed and the camera's recording circuit. The BMS manages charge from the hardwire or USB input and protects the cell from the voltage spikes that occur on engine start.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a DashCam 25 unit. The BMS accepted the cell without fault codes, parking mode engaged normally, and the cell held charge across multiple sessions without voltage sag interrupting footage writes.
• First cycle after installation: After fitting the new cell, complete one full drive with the dashcam connected to power before relying on parking mode. The capacitor management system calibrates against the new cell during that initial charge cycle — parking mode duration will not be accurate until that calibration completes.

Why the DashCam 25 cuts power mid-write and corrupts footage files

When the internal Li-Polymer cell degrades, its ability to smooth voltage between the input feed and the recording circuit drops. The camera draws a short current spike each time it commits a video segment to the SD card. A weak cell cannot hold voltage steady during that write spike, and the recording circuit loses power mid-write. The resulting file is incomplete or unreadable. Replacing the cell eliminates the voltage sag at the write event and restores clean file commits.

Parking mode recording stops after only a short time in a hot car

The DashCam 25 housing traps heat when the vehicle is parked in direct sun. Sustained recording draw in an enclosed, hot cabin raises the cell temperature above the BMS thermal cutoff threshold — typically around 60°C — and the BMS shuts down output to protect the cell. The camera goes dark even though the cell still has charge remaining. If this happens repeatedly, park in shade or use a dashcam hardwire kit with a voltage cutoff relay set to 12.2V so the camera stops recording before thermal conditions peak.