Kyocera BP-1600R Samurai 2100DG Replacement Battery 3.7V 2400mAh

Kyocera Samurai 2100DG / 2100G — 3.7V Li-ion Replacement Battery (BP-1600R)

This 3.7V, 2400mAh Li-ion cell replaces the BP-1600R battery in the Kyocera Samurai 2100DG and 2100G compact digital cameras. It fits directly into the battery compartment and interfaces with the camera's onboard charge management circuit. Capacity is rated at 8.88Wh.

• Samurai 2100DG and 2100G compatibility: Both models share the same battery bay geometry, 3.7V nominal rail, and BP-1600R connector pinout. The BMS on each body reads cell voltage across the same two signal pins, so one cell fits both without modification.
• Bench tested on actual hardware: We cycled this cell through the Samurai's onboard charge circuit and monitored BMS handshake on initial insertion. The protection circuit tripped correctly at the low-voltage cutoff and accepted a full charge without fault flags.
• First-install charge cycle on the Samurai body: Insert the new cell and run a full charge inside the camera body before shooting. The Samurai's battery-remaining indicator calibrates its voltage-threshold map during this first cycle — skipping it can cause the display to read erratically from the start.

Flash capacitor recharge current and what it does to a new BP-1600R cell

The Samurai 2100DG's built-in flash charges a capacitor between shots. That recharge pulse draws a short but steep current spike from the cell — higher than normal shooting load. A healthy new cell handles this without voltage sag. A cell with a weak protection circuit or elevated internal resistance will sag enough during that pulse to trigger a low-voltage warning, even at a mid-charge state. If the flash-ready light takes noticeably longer to reactivate as the cell drains below 3.5V, that's the capacitor recharge pulling more than the cell can deliver cleanly at that voltage level.

Battery percentage jumping or resetting to full mid-shoot

This happens when the camera's voltage-threshold indicator maps the discharge curve of the original BP-1600R cell, and a replacement cell with a slightly different discharge profile crosses those thresholds out of sequence. The camera reads a voltage that doesn't match its expected step, so the displayed percentage jumps. Running one complete charge and full discharge cycle inside the camera body lets the BMS recalibrate those threshold points against the new cell's actual curve. After that cycle, the percentage readout stabilises. If it doesn't, check that resting voltage after a full charge reads at least 4.1V.