PROSIO NP-900 Sony Cyber-shot Replacement Battery 3.7V 600mAh

PROSIO Slim Neo Xc534 / Slim Neo Xi — 3.7V Li-ion Replacement Battery (NP-900)

This is a 3.7V 600mAh (2.22Wh) lithium-ion battery for the Sony-compatible Slim Neo Xc534 and Slim Neo Xi compact digital cameras. It slots into the NP-900 battery compartment and restores full camera function. Part numbers NP-900, 02491-0015-00, BATS4, and 02491-0037-00 all cross-reference this cell.

• Slim Neo Xc534 and Slim Neo Xi fit: Both models share the same NP-900 form factor, 3.7V voltage rail, and connector pinout. The battery compartment dimensions — 43.70 × 31.30 × 7.00mm — are identical across both bodies, so the same cell fits either without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the bench. The BMS held the 3.7V nominal rail correctly, and protection circuits triggered at expected cutoff voltages during deep-draw simulation. No anomalous heat or voltage spikes were recorded.
• First-use charge cycle on Slim Neo bodies: Run the first full charge through the camera body itself, not a third-party external charger. The Slim Neo BMS maps its battery-remaining display against a charge curve recorded on the initial cycle — skipping this step can cause the indicator to read inaccurately throughout the cell's life.

Camera showing dead battery indicator on a partially charged replacement cell

The Slim Neo's fuel gauge maps percentage readings to a discharge curve calibrated against the original NP-900 cell. A new replacement cell has a slightly different discharge curve profile at low states of charge, which can trigger a false low-battery warning even when the cell still holds usable voltage. The fix is completing two full charge-discharge cycles through the camera body. After two cycles, the BMS recalibrates its threshold mapping and the indicator stabilises. If the camera still shuts down early, check that resting cell voltage reads at least 3.6V with a multimeter before dismissing the cell as faulty.

Battery percentage jumping erratically during shooting

Erratic percentage jumps — for example, dropping from 60% to 20% and then recovering — point to the camera's voltage-threshold indicator misreading the new cell's discharge curve. Compact cameras like the Slim Neo use stepped voltage thresholds rather than coulomb counting, so any curve difference between the old and new cell causes skipped or repeated percentage steps. This is not a fault with the cell itself. Perform one complete charge to 4.2V followed by a full discharge through normal use, then recharge — the indicator behaviour corrects after the camera body logs the actual curve of the new cell.