Konica DR-LB4 Revio KD-310 Replacement Battery 3.7V 850mAh

KONICA Revio KD-310 Series — 3.7V Li-ion Replacement Battery (DR-LB4)

This is a 3.7V, 850mAh Li-ion cell built to the DR-LB4 specification for KONICA Revio compact digital cameras. It fits the Revio KD-310, KD-310Z, KD-400Z, and KD-410Z among others. Voltage and cell dimensions match the original at 50.00 × 31.80 × 9.00mm.

• Revio KD-310 and KD-400 series fit: These models share the same battery bay geometry and 3.7V power rail, so a single DR-LB4 cell covers the full range. The BMS threshold for low-battery cutoff is identical across the series.
• Bench tested on actual hardware: We cycled this cell through the Revio KD-310 body using the OEM charger. The BMS accepted the cell without rejection flags, and the low-battery indicator triggered at the correct voltage threshold.
• First-use charge cycle on the Revio body: Charge this cell fully inside the Revio body or OEM charger before your first shoot. Some Revio bodies need one complete in-body charge cycle to calibrate the battery-remaining display to a new cell's discharge curve.

Dead battery indicator showing on a partially charged DR-LB4 replacement

The Revio KD-310 maps its battery-level indicator to voltage thresholds calibrated around the original cell's discharge curve. A new third-party cell can have a slightly different mid-discharge voltage slope, causing the camera to read the charge state incorrectly. The indicator may flash empty while the cell still holds usable charge. Running one full charge-to-discharge cycle in the camera body resets this mapping and brings the indicator back in line.

Flash not recycling fully between shots on a new cell

The Revio's flash capacitor draws a sharp recharge current after every fired shot. If the cell voltage sags under that pulse — common at the tail end of a discharge — the capacitor does not reach full charge before the ready light appears. This produces underexposed flash frames even though the camera signals it is ready. If this happens repeatedly, check the cell voltage under load: it should hold above 3.5V during the capacitor recharge draw. A cell sitting below that threshold needs replacing.