Drift HD170 Replacement Battery 3.7V 1800mAh Li-ion

Drift HD170 / HD170S — 3.7V Li-ion Replacement Battery (DRIFLLBAT)

This 3.7V, 1800mAh lithium-ion battery replaces the DRIFLLBAT cell in the Drift HD170 and HD170S action cameras. It fits the compact battery bay directly and supplies the voltage rail the camera's BMS expects. Use it as a spare when the original cell can no longer hold charge through a full recording session.

• HD170 and HD170S compatibility: Both models share the same physical form factor and BMS handshake requirements. The cell dimensions — 53.00 × 35.30 × 11.00mm — match the OEM bay, and the 3.7V nominal voltage aligns with the power rail both cameras use for sensor and video processing.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the HD170 platform. The BMS accepted the cell without fault codes, held a stable voltage curve through the mid-discharge range, and triggered the low-battery indicator at the expected threshold before cutoff.
• First-cycle initialisation on the HD170: Charge this cell fully inside the HD170 or HD170S body before your first shoot. Some action camera BMS firmware maps battery-remaining percentage to the new cell's discharge curve only after completing one full charge cycle from within the camera body.

Battery percentage display jumping erratically on the HD170

The HD170 maps its battery indicator to a voltage-threshold table calibrated to the original cell's discharge curve. A new replacement cell — even with identical chemistry — can sit at a slightly different voltage at any given state of charge. The camera's firmware reads that voltage, finds no matching entry in its lookup table, and jumps the display between levels. Running one full charge-discharge cycle inside the camera body lets the BMS re-map the indicator to the replacement cell's actual curve. After that cycle, the display should track smoothly from full down to the low-battery warning at approximately 3.0V.

HD170 showing dead battery indicator on a cell you just charged

This usually means the cell voltage dropped below the camera's minimum acceptance threshold during storage or shipping — typically below 2.5V. At that level, the HD170's BMS refuses to engage the load circuit and flags the cell as flat. Connect the battery to a compatible external charger first and bring it to at least 3.0V before inserting it into the camera. Once above that floor, the camera body will recognise it and allow normal charging to resume.