Kyocera NP-900 EZ 4033 Replacement Battery 3.7V 600mAh

Kyocera EZ 4033 — 3.7V Li-ion Replacement Battery (NP-900)

This is a 3.7V, 600mAh Li-ion replacement cell for the Kyocera EZ 4033 digital camera. It matches the OEM NP-900 form factor, voltage, and connector. Fits the EZ 4033 body directly — no adapters or modification needed.

• EZ 4033 battery slot compatibility: The NP-900 format is shared across Kyocera's compact EZ-series cameras because they run the same 3.7V single-cell architecture. Same connector orientation, same BMS handshake voltage, same physical footprint at 43.70 × 31.30 × 7.00mm.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the EZ 4033 platform. The BMS accepted the cell without error flags, and protection circuits tripped correctly at low-voltage cutoff — no runaway discharge on the bench.
• First-use charge cycle on the EZ 4033: Run one full charge cycle through the camera body or OEM charger before shooting. The EZ 4033's battery-remaining indicator maps to the cell's discharge curve — skipping this step can cause the indicator to read inaccurately from the first shot.

EZ 4033 showing a dead-battery indicator on a partially charged replacement cell

The EZ 4033 estimates remaining charge by reading cell voltage against a stored discharge curve. A new replacement cell's curve doesn't always match that stored reference on the first install. The camera interprets the voltage offset as a low or dead cell and shuts down early. One full charge-discharge cycle through the camera body re-aligns the BMS reference points, and the indicator normalises from the next session onward.

Battery percentage jumping erratically on the EZ 4033 display

This happens when the camera's voltage-threshold map doesn't match the discharge curve of the replacement cell. The indicator jumps because it's hitting thresholds out of sequence — 60% dropping to 20% with no warning, for example. It's a calibration issue, not a faulty cell. Discharge the battery fully until the camera shuts off, then charge it to 100% uninterrupted — the threshold map resets and the display stabilises at 4.2V full charge.