Kyocera Finecam S3R 7.4V Replacement Battery 29518

Kyocera Finecam S3R — 7.4V Li-ion Replacement Battery (29518)

This is a 7.4V, 2000mAh Li-ion battery for the Kyocera Finecam S3R compact digital camera. It replaces OEM part numbers 29518, 38403, 46607, 52030, C8872A, and EI-D-LI1. The battery matches the original connector, cell voltage, and BMS profile of the S3R's power system.

• Finecam S3R compatibility: The S3R uses a single 7.4V Li-ion cell pack with a two-wire BMS handshake. All listed OEM part numbers share the same connector pinout and voltage rail, so this replacement communicates correctly with the camera's charge controller without triggering a "battery error" flag.
• Bench tested on actual hardware: We cycled this pack through the S3R's charge and discharge circuit, confirmed BMS cutoff at the correct low-voltage threshold, and verified the charge controller accepted the pack without error flags at both cold start and mid-session reinsertion.
• First-session initialisation: After fitting this battery, let the camera run a full charge cycle from the OEM charger before your first shoot. The S3R's fuel gauge recalibrates its percentage display to the new cell's charge curve during that first cycle — skipping it causes the indicator to drop inaccurately in the first session.

Why the Finecam S3R shows a battery error immediately after inserting a new pack

The S3R checks BMS communication at power-on before displaying the live view. If the replacement pack has been in storage, its cell voltage may have dropped below the camera's minimum recognition threshold — typically around 6.0V on a 7.4V nominal pack. The camera interprets a silent or low-voltage BMS response as a fault and throws an error rather than powering on normally. Connect the pack to the OEM charger for 15–20 minutes before reinserting — this pulls the cell voltage above the BMS wake threshold and restores normal communication.

Battery percentage jumping erratically during continuous shooting bursts

During burst shooting, the S3R drives the image sensor, processor, and flash circuit simultaneously, causing short but sharp current spikes. These spikes create a momentary voltage sag at the battery terminals, which the camera's percentage indicator reads as a sudden capacity drop. Once the burst ends and current draw returns to idle, voltage recovers and the percentage jumps back up. This is a display calibration artefact — run one full charge-discharge cycle through the camera and the indicator will track the cell's actual state curve accurately at 4.2V full and 6.0V cutoff.