HP F520 Dashcam Replacement Battery 3.7V 450mAh

HP F520 / F310 Series — 3.7V Li-Polymer Replacement Battery

This 3.7V, 450mAh Li-Polymer cell is a direct internal replacement for the HP F520, F520G, F500G, and F310 dashcams. These compact dash cameras use a small internal battery to maintain parking mode recording and buffer power between ignition cycles. When the original cell degrades, parking mode cuts short and the unit may fail to boot cleanly on engine start.

• F520 / F310 platform compatibility: These models share the same internal cell footprint — 35.60 × 24.60 × 5.80mm — and the same 3.7V charging rail fed by the dashcam's USB or hardwire kit. Swapping the cell restores full voltage to the onboard recording controller without any firmware changes.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench, confirmed the BMS accepted the pack without fault flags, and verified charge termination at 4.2V with no thermal anomaly during sustained draw.
• First parking mode cycle after install: After fitting the new cell, complete one full charge via hardwire or USB before parking mode is active. The dashcam's capacitor management system calibrates parking mode duration against the new cell during that first full cycle — skipping it means parking mode may cut out earlier than expected.

Footage corrupt or missing after parking mode session

Corrupt clips are almost always a power interruption mid-write. When the internal cell can no longer sustain the voltage the write buffer needs, the dashcam cuts power before the file is closed properly. A degraded 450mAh cell can sag below the controller's minimum threshold during a long stationary recording session. Replacing the cell restores stable voltage to the write buffer and eliminates mid-write dropouts.

Internal battery hot after a parking mode session in a closed car

The F520's compact housing has minimal airflow, and sustained parking mode draw in an enclosed vehicle can raise cell temperature noticeably. This is more pronounced with an aged cell running at higher internal resistance to deliver the same current. A fresh 450mAh cell has lower internal resistance and runs cooler under the same load. If the unit still feels hot after replacing the cell, check that the dashcam firmware parking mode sensitivity is not set to its highest recording threshold, which increases duty cycle and heat.