Leica D-Lux Type 109 Replacement Battery BP-DC15 7.4V 750mAh

Leica D-Lux Type 109 — 7.4V Li-ion Replacement Battery (BP-DC15)

This 7.4V, 750mAh Li-ion cell is a direct replacement for the BP-DC15 battery in the Leica D-Lux Type 109 compact camera. It fits the battery compartment and connects through the same contact layout as the original. Swap it in when the factory cell no longer holds a charge through a full shoot.

• D-Lux Type 109 fit: The D-Lux Type 109 uses the BP-DC15 cell format — same voltage rail, same physical footprint, same contact orientation. No adapters. The body accepts this cell the same way it accepts the factory pack.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the bench. The BMS held the 7.4V nominal rail without sag and accepted charge via both OEM charger and in-camera USB charging without triggering fault flags.
• First-cycle initialisation on the D-Lux Type 109: Complete one full charge cycle inside the camera body or OEM charger before your first heavy shoot. Some Leica BMS firmware maps the battery-remaining indicator against the discharge curve only after the first calibrated cycle — skipping this step can cause the indicator to read inaccurately from the first frame.

Why the D-Lux Type 109 battery indicator jumps erratically with a new cell

The D-Lux Type 109 maps remaining charge against a stored discharge curve. A new cell has a slightly different open-circuit voltage profile at each state of charge compared to the worn cell the camera learned from. Until the camera samples one full discharge cycle, it interpolates badly — showing 60%, then 30%, then back to 50% within a few frames. Run the new cell down to near-empty and recharge fully once. After that cycle, the indicator tracks predictably.

Flash not fully recycling between shots on a new replacement cell

Flash recycle draws a short but steep current spike to recharge the capacitor. If the cell voltage sags under that spike — common when a cell is cold or not yet broken in — recycle time stretches noticeably. This is not a faulty cell. Let the camera and battery reach room temperature before shooting flash-heavy sequences. After two or three full charge cycles, internal resistance drops and recycle current stabilises. If the problem persists past three cycles, check that the battery contacts are clean and seated fully — dirty contacts add measurable resistance at that current draw.