Braun D808 Compatible Battery 3.7V 850mAh Li-ion

Braun D808 — 3.7V Li-ion Replacement Battery

This 3.7V, 850mAh Li-ion cell replaces the original battery in the Braun D808 digital camera. It powers the image sensor, processor, and all in-body functions the camera needs to shoot and write files. Capacity figures come from the product specification — 850mAh / 3.15Wh.

• D808 platform fit: The D808 uses a flat-profile Li-ion cell at 3.7V nominal. The contact layout and cell footprint — 40.20 × 35.30 × 6.10mm — match the battery bay directly. No adapter or modification needed.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a camera-class load. The BMS held within normal voltage rails throughout, and the protection circuit tripped correctly at low-voltage cutoff without false positives.
• First charge cycle on the D808: Run the first full charge inside the camera body or OEM charger before shooting. Some Braun camera BMS systems only begin accurate battery-remaining calibration after the cell completes one charge cycle through the body's own charge controller.

Dead battery indicator showing on a partially charged replacement cell

Camera battery indicators map voltage thresholds to percentage segments. A new third-party cell can have a slightly different discharge curve than the OEM cell the camera was calibrated against. When the camera reads voltage near the boundary between two display segments, it may flag a low-battery warning even when the cell has usable charge remaining. Completing one full charge-to-discharge cycle through the camera body gives the BMS enough data to adjust its threshold mapping. After that cycle, the indicator tracks the actual state of charge more closely.

Battery percentage jumping erratically during a shoot

Erratic percentage readings happen when the camera's voltage-to-percentage lookup table doesn't align with the new cell's discharge curve. The D808 samples terminal voltage at intervals and converts that to a display value — if the new cell sits at a voltage the original table treats as ambiguous, the readout jumps between segments. This is a calibration issue, not a cell fault. Run one full discharge to low-battery cutoff, then a full charge, to let the system re-anchor its reference points. After that, readings should stabilise across the charge range.