Panasonic HX-A100 Replacement Battery 3.7V 1500mAh

Panasonic HX-A100 / HX-A1M / HX-A500 — 3.7V Li-Polymer Replacement Battery (VSB0526)

This 3.7V 1500mAh Li-Polymer cell replaces the VSB0526 battery in the Panasonic HX-A100 wearable action camera and its variants, including the HX-A1M, HX-A100-H, and HX-A500. The slim 63 × 42 × 4.5mm form factor matches the original cell's footprint exactly. Voltage and capacity are matched to what Panasonic specified for this camera line.

• HX-A series compatibility: The HX-A100, HX-A1M, HX-A100-H, and HX-A500 all run on the same 3.7V rail with the same VSB0526 connector footprint and BMS handshake. One cell covers the full wearable range without modification.
• Bench tested on actual hardware: We cycled this cell through the HX-A100 body and monitored BMS communication. The protection circuit responded correctly to charge termination and low-voltage cutoff — no false trips under normal camera load.
• First charge cycle on camera body: Charge this cell in the HX-A100 body via the OEM charger before your first recording session. Some Panasonic wearable BMS systems need one full in-body charge cycle to correctly map the battery-remaining percentage display to the new cell's discharge curve.

Why the HX-A100 runs warm during sustained video recording

The HX-A100 stacks image sensor readout, video encoding, image stabilisation, and wireless output into a body smaller than most phones. That combined draw pulls more continuous current from the cell than a still-photo session ever would. Li-Polymer cells generate heat as internal resistance rises under sustained load — especially in a sealed housing with no active airflow. Keeping the camera out of direct sunlight during long clips reduces heat buildup and slows voltage sag at the cell level.

Battery percentage jumping erratically on the HX-A100 display

The HX-A100's fuel gauge maps voltage thresholds to percentage steps that were calibrated against the original cell's discharge curve. A new Li-Polymer cell has a slightly flatter discharge curve early in its life, so the camera's indicator can read 80% one moment and drop to 50% after a short clip. This is a gauge calibration issue, not a cell fault. Run two or three full charge-and-discharge cycles in the camera body and the BMS will re-map the thresholds — the readout will stabilise to within a few percentage points.