Leica D-LUX5 Replacement Battery 3.7V 850mAh 18719

Leica D-LUX5 / D-LUX6 / V-LUX 2 — 3.7V Li-ion Replacement Battery (18719 / BP-DC9)

This 3.7V, 850mAh Li-ion cell replaces the Leica 18719, 18720, BP-DC9, BP-DC9E, and BP-DC9U batteries. It fits the D-LUX5, D-LUX5E, D-LUX6, and V-LUX 2 camera bodies. Dimensions match the OEM pack at 41.70 × 35.60 × 10.05mm, so it seats and latches without modification.

• D-LUX5, D-LUX6, and V-LUX 2 compatibility: These four bodies share the same battery bay geometry, contact layout, and 3.7V supply rail, which is why a single cell covers all of them. The BMS handshake is identical across the group.
• Bench tested on actual hardware: We cycled this cell through the D-LUX6 body using the OEM charger and confirmed the BMS accepted the cell, reported charge state correctly, and held voltage above 3.5V through full discharge without triggering an early low-battery cutoff.
• First-use charge cycle on camera bodies: Insert the cell and run one complete charge cycle inside the camera body or OEM charger before shooting. Leica's BMS uses that first cycle to map the cell's discharge curve — skipping it can cause the battery-remaining indicator to read inaccurately from the first shot.

Dead battery indicator on the D-LUX5 display with a freshly charged replacement

The D-LUX5 uses a voltage-threshold lookup to estimate remaining charge. A new third-party cell has a slightly different discharge curve than the OEM cell the camera was calibrated against. On first install, the body sometimes reads a full cell as empty because the resting voltage sits just outside its expected window. Insert the cell, place it in the OEM charger until the charge light goes solid, then re-insert into the camera body — this resets the threshold comparison and the indicator reads correctly.

Battery percentage jumping erratically during a D-LUX6 shoot

This happens when the camera's fuel-gauge algorithm hasn't completed its initial discharge-curve mapping. The indicator jumps because the body is interpolating between voltage checkpoints it hasn't confirmed yet. It typically stabilises after one full charge-to-discharge cycle completed inside the camera. Run the cell down to the low-battery warning under normal shooting load, then charge fully to 4.2V — subsequent readings will track smoothly.