About this replacement
Leica X1 — 3.7V Li-ion Replacement Battery (BP-DC8)
This is a 3.7V, 1400mAh Li-ion cell built to the BP-DC8 specification for the Leica X1 compact digital camera. It fits the X1 body directly, using the same connector and contact layout as the original. Voltage and capacity match OEM figures — 3.7V nominal, 5.18Wh total energy.
- Leica X1 fit: The X1 uses a single BP-DC8 cell to power both the sensor and the fixed 36mm Elmarit lens drive. There is no multi-cell pack here — one cell does all the work, so exact voltage tolerance matters to the body's power management logic.
- Bench tested on actual hardware: We cycled this cell through the X1 body and a compatible BP-DC8 charger. The BMS accepted the cell on first insert, reported charge state correctly, and held cutoff at the expected low-voltage threshold without tripping early.
- Charger compatibility on first use: The X1 body can charge via USB in some configurations, but the BMS reads the cell most accurately when the first full charge runs through a dedicated BP-DC8 charger. Skipping this can cause the battery indicator to display incorrectly for the first few cycles.
Why the X1 battery indicator reads full then drops suddenly
The X1 maps battery percentage to fixed voltage thresholds set for the original Panasonic-sourced BP-DC8 cell. A new third-party cell may have a slightly different discharge curve, sitting above the first threshold longer before dropping. This makes the indicator hold at full or high for an extended period, then fall faster near the end. It is not a fault — it normalises after two or three full charge and discharge cycles as the BMS learns the cell's actual curve.
X1 displaying "no battery" or rejecting a valid cell on insert
The X1 performs a contact handshake on power-up. If the cell voltage is below roughly 3.0V on arrival — which can happen after long storage in transit — the body may refuse to initialise and show no battery detected. Place the cell in a dedicated BP-DC8 charger first and bring it to at least 3.6V before inserting it into the camera. Once the charger confirms a partial charge, the body will accept it and resume normal communication.