Drift HD170 Replacement Battery 3.7V 1050mAh Li-ion

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

This is a 3.7V 1050mAh Li-ion battery for the Drift HD170 and HD170S action cameras. It fits both variants of the HD170 body and matches the original cell's physical dimensions at 53.20 x 35.30 x 7.10mm. Capacity is sourced from the product specification — 1050mAh (3.89Wh).

• HD170 and HD170S compatibility: Both models share the same battery bay, connector pinout, and BMS handshake protocol. A single cell covers both without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the HD170 platform. The onboard BMS accepted the cell without error flags and held voltage within the expected discharge curve under continuous 1080p recording load.
• First-use charge cycle on the HD170: Insert the battery and charge it fully inside the camera body before your first recording session. The HD170's BMS maps the new cell's charge curve during this first in-body cycle — skipping it can cause the remaining battery indicator to read inaccurately throughout the cell's life.

Why the HD170 battery indicator reads full then drops suddenly

The HD170 uses a voltage-threshold method to estimate charge level rather than a coulomb-counting fuel gauge. A new Li-ion cell has a flatter discharge curve than an aged original battery, so the camera's fixed voltage thresholds don't map cleanly to the new cell's actual state of charge. The result is an indicator that stays at full longer than expected, then steps down quickly near the end. Completing one full in-body charge cycle recalibrates the reference point and narrows this gap.

HD170 showing no battery or refusing to power on with a new cell installed

This happens when the BMS has not completed its initial authentication pass on the new cell. The camera expects a minimum resting voltage — typically above 3.5V — before it will boot. If the replacement cell shipped in a low storage state, the camera may refuse to start. Connect the camera to its OEM charger or a USB source first, allow it to charge for at least 15 minutes, then attempt to power on. If the camera still shows no battery, reseat the cell and confirm the contacts are clean and fully engaged.