Rollei DS-S50 Actioncam Bullet 6S WiFi 3.7V Replacement Battery

Rollei Actioncam Bullet 6S WiFi — 3.7V Li-ion Replacement Battery (DS-S50)

This is a 3.7V, 1500mAh Li-ion replacement cell for the Rollei Actioncam Bullet 6S WiFi, 7S WiFi, Actioncam 6S WiFi, and Actioncam 7S WiFi. It uses the DS-S50 OEM part number and matches the original cell's voltage, capacity, and physical dimensions exactly at 45.70 x 39.00 x 14.10mm. Swap it in when the original cell no longer holds a useful charge or when you need a spare on location.

• Bullet 6S / 7S WiFi platform fit: The 6S and 7S WiFi share the same battery bay geometry and 3.7V power rail, which is why both models draw from the same DS-S50 cell. The connector pinout and BMS communication protocol are identical across the platform, so one cell covers all four listed models without modification.
• Bench tested on actual hardware: We cycled this cell through the Bullet 6S WiFi body under sustained 1080p recording load. The BMS accepted the cell on first insertion, voltage held steady through the discharge curve, and the protection circuit tripped correctly at the low-voltage threshold — no unexpected cutoffs mid-session.
• First charge on new cell: Run the first full charge cycle inside the camera body using the original Rollei charger or USB cable rather than a third-party external charger. Some Rollei bodies need one in-camera charge cycle to calibrate the battery-remaining display correctly against the new cell's discharge curve.

Battery percentage jumping erratically on the Bullet 6S WiFi display

The Bullet 6S WiFi estimates remaining charge by mapping display voltage against a stored discharge curve from the original cell. A new replacement cell's discharge curve sits slightly differently — flatter in the mid-range, then dropping off more steeply near the end. The camera's indicator interprets that mismatch as erratic jumps, not a fault with the cell itself. Run two full charge-to-discharge cycles inside the camera body and the indicator will track accurately against the new curve.

Camera showing dead battery indicator on a partially charged DS-S50 cell

If the Bullet 6S WiFi displays a dead or critically low battery icon immediately after inserting a replacement cell, the body's BMS has not yet authenticated the new cell against its voltage reference. This happens most often when the cell rested in storage and surface voltage dropped below the camera's acceptance threshold — typically around 3.4V. Place the cell in the camera, connect it to charge via the OEM cable for at least 15 minutes, then power on. That short charge pulse brings the cell above the 3.6V threshold the BMS requires to register a valid battery.