Toshiba Camileo BW10 HD Replacement Battery PX1686U 3.7V

Toshiba Camileo BW10 HD / SX900 / SX500 — 3.7V Li-ion Replacement Battery (PX1686U)

This is a 3.7V Li-ion cell rated at 740mAh (2.74Wh), built to replace the OEM battery in the Toshiba Camileo BW10 HD, BW10, SX900, and SX500 compact HD camcorders. The original PX1686U cell degrades after repeated charge cycles and loses the capacity to sustain a full recording session. This replacement fits the same slot and uses the same connector as the factory unit.

• Camileo BW10 and SX-series shared cell: The BW10 HD, BW10, SX900, and SX500 all draw from the same 3.7V single-cell architecture with identical connector pinout and physical form factor. One cell fits all four models without any modification to the battery door or contacts.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Camileo platform and confirmed the BMS accepted the cell without triggering a rejection flag. Voltage output held steady across HD video capture loads until the protection circuit engaged at the low-voltage cutoff threshold.
• First-use charge cycle on Camileo BW10: Insert the battery and charge it fully through the camera body or the OEM charger before your first shoot. The Camileo BMS maps battery-remaining percentage against the cell's discharge curve during this first cycle — skipping it causes the indicator to read inaccurately throughout the cell's life.

Why the Camileo SX900 shuts down before the battery indicator hits empty

The SX900 uses a voltage-threshold system to estimate remaining charge. If the BMS has not calibrated to the new cell's discharge curve, it triggers an early shutdown when voltage sags briefly under the combined load of the image sensor and recording processor — even if usable charge remains. This is a calibration issue, not a cell fault. Run the battery from 100% to automatic shutoff twice without interrupting the discharge, and the camera's threshold mapping will align to the replacement cell's actual curve.

Battery percentage jumping erratically on the Camileo display after fitting a new cell

When the Camileo body has not seen this cell's specific discharge profile before, the indicator can jump — for example, reading 60%, then 80%, then 40% within a short span. The camera is polling voltage and mapping it against a stored lookup table calibrated to the original cell. A new Li-ion cell has a slightly flatter mid-range discharge curve, which confuses that lookup. Charge the replacement to 4.2V (full charge) via the OEM charger, then let the camera run it down to auto-shutoff — one full cycle resets the indicator mapping.