Minolta NP-500 DiMAGE G400 Replacement Battery 3.7V 850mAh

Minolta DiMAGE G400 / G500 / G530 / G600 — 3.7V Li-ion Replacement Battery (NP-500 / NP-600)

This 3.7V, 850mAh Li-ion cell replaces the Minolta NP-500 and NP-600 batteries used in the DiMAGE G400, G500, G530, and G600 compact digital cameras. It slots into the same battery compartment and connects through the same three-contact interface the camera body uses to read charge state. Capacity is 850mAh (3.15Wh), matching the original specification.

• G400 / G500 / G530 / G600 shared platform: These four DiMAGE models run the same 3.7V battery architecture and use an identical physical bay and contact layout. One cell works across the entire G-series line because Minolta standardised the connector and BMS communication protocol across those bodies.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on compatible hardware. The BMS accepted the cell without rejection flags, reported charge state through the camera's indicator, and held voltage within expected range through full discharge.
• First-install charge cycle on G-series bodies: Insert the new cell and charge it fully through the camera body or OEM charger before shooting. The G-series BMS maps its battery-remaining display against a completed charge curve — skipping this step can cause the indicator to read inaccurately from the first session.

Dead battery indicator on the DiMAGE G400 with a partially charged replacement cell

The G400 uses a voltage-threshold system to estimate remaining charge. A new Li-ion cell has a slightly different resting voltage profile than a well-used original, which can push the camera's threshold check below its acceptance point at partial charge states. The camera then flags low battery or shuts down even though the cell holds usable energy. Completing one full charge cycle inside the camera body recalibrates the threshold mapping and resolves the false low-battery read.

Battery percentage jumping erratically on the DiMAGE G500 and G530 display

This happens when the camera's indicator tries to map a new cell's discharge curve against the lookup table built for the aged original. A fresh Li-ion cell holds a flatter voltage curve through mid-charge, which the camera misreads as sudden capacity swings. The display may jump from 80% to 20% with no warning. One full charge-discharge cycle through the OEM charger lets the BMS resample the curve — after that, the readout stabilises and tracks the actual state of charge correctly.