Ricoh DB-100 CX3 Replacement Battery 3.7V 800mAh

Ricoh CX3 / CX4 / CX5 / CX6 Series — 3.7V Li-ion Replacement Battery (DB-100)

This 3.7V, 800mAh Li-ion battery replaces the Ricoh DB-100, LB-050, DB-110, and DB-L110 cells across the CX3, CX4, CX5, and CX6 compact camera range, plus 16 additional compatible models. It fits directly into the battery compartment and connects to the same five-pin contact array used by the original OEM cell. Capacity is rated at 2.96Wh.

• CX3–CX6 platform compatibility: All four CX-series bodies share the same physical footprint, contact layout, and BMS communication protocol — which is why one cell part number covers the entire run. The DB-100 designation carried through each revision without electrical changes to the battery interface.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on CX-series bodies. The BMS accepted the cell, reported state-of-charge correctly after one full charge cycle completed from the camera body, and thermal behaviour stayed within normal operating range across sustained burst shooting.
• Flash recycling and draw management: On CX-series cameras, the flash capacitor pulls a sharp recharge current between shots. Avoid shooting in continuous flash mode with the cell below roughly 30% — at that point, recharge lag between flash cycles increases noticeably and the camera may flag a low-battery warning even if the cell has remaining capacity.

Why the CX3 shows a dead battery indicator on a new replacement cell

The CX3's battery fuel gauge maps state-of-charge based on a voltage curve calibrated to the OEM cell's discharge profile. A new third-party cell often arrives at storage voltage — around 3.6V — which the camera interprets as near-empty. This is not a fault. Place the battery in the camera or an OEM-compatible charger and run one complete charge cycle. After that cycle, the indicator will track accurately against the new cell's actual discharge curve.

Battery percentage jumping erratically on the CX4 or CX5 display

Erratic percentage readings happen when the camera's voltage-threshold table doesn't yet match the new cell's discharge curve. The CX-series firmware samples voltage at fixed intervals and converts those readings to percentage steps — if the cell's internal resistance differs slightly from OEM spec, early readings can jump by 10–20% between shots. Run two full charge-discharge cycles through the camera body. By the second cycle, the BMS has enough data points to smooth the display. If it persists past two cycles, check that the battery contacts are clean and seating fully — a partial contact raises apparent internal resistance and amplifies the effect.