Minolta NP-400 Replacement Battery 7.4V 1500mAh Li-ion

Minolta A Sweet Digital / DImage A1 / A2 Series — 7.4V Li-ion Replacement Battery (NP-400)

This is a 7.4V, 1500mAh Li-ion replacement for the Minolta NP-400 battery. It fits the Minolta A Sweet Digital, A-7 Digital, DImage A1, DImage A2, and several additional Minolta camera bodies that share the same NP-400 form factor. Capacity matches the original at 1500mAh (11.1Wh).

• NP-400 platform compatibility: These Minolta bodies share a common battery bay geometry, contact layout, and BMS handshake protocol. The NP-400 cell slides into each body identically, and the camera's charge-management circuit communicates with the protection board the same way across the range.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a DImage A2 body. The BMS accepted the cell without fault codes, the camera reached a full state of charge correctly, and the protection circuit tripped as expected at the low-voltage cutoff threshold.
• First-install charge cycle on Minolta bodies: Before shooting, run one full charge cycle through the camera body or OEM charger. Minolta's battery-remaining display calibrates its voltage-threshold map during this first cycle — skipping it can cause the indicator to read inaccurately from the first shot.

Flash recycling slowing down mid-shoot on the DImage A2

The DImage A2's built-in flash draws a sharp recharge current spike after each exposure to refill the capacitor. As cell voltage drops toward the lower end of its discharge curve, that spike causes a momentary voltage sag across the battery terminals. The camera responds by extending the recycling delay before allowing the next flash-assisted shot. This is not a fault — it is the BMS protecting the cell from over-discharge during a high-current event. If recycling delay increases noticeably, the cell is below roughly 7.0V and nearing end of charge.

Battery percentage jumping erratically on the camera display

Minolta camera bodies map their fuel-gauge indicator to a voltage-threshold table calibrated during the first full charge cycle. A new cell installed without that initial cycle has a discharge curve the camera hasn't yet mapped, so the indicator jumps between readings as voltage briefly crosses multiple thresholds under varying loads. The fix is straightforward: charge the battery fully in the camera body or OEM charger, then run it down through normal shooting to near empty, and charge again. After one complete cycle, the indicator stabilises and tracks the remaining charge accurately.