Kyocera BP-760S i4R Compatible Battery 3.7V 500mAh

Kyocera i4R / i4RB / i4RBK — 3.7V Li-ion Replacement Battery (BP-760S)

This is a 3.7V, 500mAh Li-ion cell built to the BP-760S specification for the Kyocera i4R, i4RB, and i4RBK compact digital cameras. It slots into the same battery compartment as the original and connects to the same three-contact terminal. Voltage and capacity match the OEM spec exactly — no padding, no false ratings.

• i4R, i4RB, and i4RBK compatibility: All three models share the same battery bay geometry, contact layout, and BMS voltage thresholds. One cell spec covers all three variants without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the i4R body. The BMS accepted the cell, the battery indicator populated correctly after one full charge cycle, and the protection circuit tripped cleanly at the low-voltage cutoff without requiring a manual reset.
• First charge via camera body: On the i4R, run the first full charge cycle with the cell seated in the camera body rather than a generic external charger. The i4R's BMS maps the new cell's discharge curve during that initial cycle — skipping it can cause the battery-remaining indicator to read inaccurately for the first several uses.

Battery percentage jumping or resetting mid-shoot on the i4R

The i4R tracks remaining charge by mapping voltage steps against a stored discharge curve. A new third-party cell has a slightly different discharge profile than the OEM cell the camera was calibrated against. Until the camera logs a full charge-to-cutoff cycle with the new cell, the indicator can jump — skipping from 60% to 20% or resetting to full briefly. Run two complete charge and discharge cycles through the camera body. After that, the indicator stabilises and tracks the actual cell voltage accurately.

Flash not recycling fully between shots on a new BP-760S cell

At 500mAh, the BP-760S delivers a limited current reserve. The flash capacitor draws a sharp recharge current after each shot — if the cell's internal resistance is elevated from storage or cold temperature, that recharge current causes a brief voltage sag. The camera's BMS interprets the sag as a low-battery condition and throttles output before the capacitor is fully charged. If flash recycle feels slow or the ready light takes longer than usual, warm the battery to room temperature and confirm resting voltage is above 3.6V before shooting.