ACME FlyCamOne HD 3.7V 550mAh Li-Polymer Replacement Battery FCHD17

ACME FlyCamOne HD Series — 3.7V Li-Polymer Replacement Battery (FCHD17)

This 3.7V, 550mAh lithium-polymer cell replaces the original battery in the ACME FlyCamOne HD, CarC, and FlyCamOne 720p compact camera drones. It matches the OEM part numbers FCHD17 and PL502548. Dimensions are 49.26 × 24.10 × 4.68mm — a direct physical match to the stock cell slot.

• FlyCamOne HD, CarC, and 720p compatibility: All three models share the same 3.7V single-cell LiPo architecture, the same physical connector, and the same BMS voltage thresholds — which is why one cell covers the full lineup.
• Bench tested on actual hardware: We cycled this cell through the FlyCamOne HD body and confirmed the BMS accepted charge, reported state-of-charge through the indicator, and held cutoff voltage at the expected 3.0V floor under load.
• First-install charge cycle on the FlyCamOne HD: Run the first full charge through the OEM USB cable connected to the camera body — not a bare LiPo charger. Some FlyCamOne BMS firmware requires one in-body charge cycle before the battery-remaining indicator maps correctly to the new cell's discharge curve.

Why the FlyCamOne HD shows a dead battery indicator on a replacement cell that still has charge

The FlyCamOne HD maps its battery indicator to a voltage-threshold table calibrated to the original cell's discharge curve. A new third-party cell with a slightly different curve can read as empty while still sitting above 3.5V. This is a firmware-side display issue, not a fault with the cell. Running one full in-body charge and discharge cycle usually syncs the indicator to the replacement cell's actual curve.

FlyCamOne HD powering off mid-flight with no low-battery warning

This happens when the BMS trips the low-voltage cutoff faster than the indicator updates — common when the drone draws burst current during rapid ascent or directional change. At that moment, cell voltage dips sharply, and the BMS shuts output before the LED or app registers low battery. The fix is to avoid flying past roughly 3.6V resting voltage on the cell. Land, check resting voltage after 60 seconds off load, and replace the cell if it settles below 3.6V at rest.