Garmin DashCam 45 Replacement Battery 3.7V 250mAh

Garmin DashCam 45 / Dash Cam 56 — 3.7V Li-Polymer Replacement Battery (361-00103-00)

This is the internal 3.7V, 250mAh Li-Polymer backup cell for the Garmin DashCam 45, Dash Cam 45, Dash Cam 56, and DashCam 56. It maintains the camera's timestamp, GPS data, and parking mode recording when the vehicle's ignition is off. When this cell depletes or fails, the dashcam loses saved settings, corrupts event files, or stops parking mode entirely.

• DashCam 45 and 56 platform fit: Both models share the same internal cell footprint, connector pinout, and BMS handshake protocol — which is why OEM part numbers 361-00103-00, 361-00103-01, and 361-00103-10 cover the full range. The 32.30 × 20.00 × 6.00mm cell dimensions are exact to the original housing cavity.
• Bench tested on actual hardware: We cycled this cell through charge and parking-mode discharge sequences on the DashCam 45. The BMS accepted the cell without error flags, reached full charge cleanly, and held voltage within spec across multiple discharge cycles.
• First-cycle calibration after installation: After fitting the new cell, complete one full drive with the dashcam connected to its power source before relying on parking mode. The dashcam's capacitor management system needs one full charge cycle to calibrate parking mode duration against the new cell's actual capacity.

Parking mode recording cutting out before you expect it to

The DashCam 45 uses its internal cell to sustain parking mode recording after the vehicle is off. A degraded or newly replaced cell may not yet be calibrated, so the BMS terminates recording earlier than the dashcam's firmware expects. This is not a firmware fault — it is the capacitor management system reading an uncalibrated state-of-charge curve. Complete two to three full drive-and-park cycles and parking mode duration will stabilise at the cell's rated capacity.

Event footage corrupt or missing after a parking mode session

If the internal cell sags below approximately 3.2V during an active write, the dashcam cuts power mid-file — leaving the last recorded clip corrupt or absent from the memory card. This happens most often with a deeply discharged or failing original cell that cannot sustain the sustained draw of continuous parking mode recording. Replace the internal cell and verify the card is formatted inside the dashcam, not on a PC, to clear any partial file system errors. After replacement, the first clean parking mode session with a fully charged cell confirms the issue is resolved.