Panasonic DMW-BLC12 Lumix DMC-GH2 Compatible Battery 7.4V 1000mAh

Panasonic Lumix DMC-GH2 Series — 7.4V Li-ion Replacement Battery (DMW-BLC12)

This 7.4V, 1000mAh Li-ion cell replaces the DMW-BLC12 battery used in the Panasonic Lumix DMC-GH2, GH2H, GH2HK, GH2K, and over two dozen additional Lumix bodies sharing the same battery bay and BMS protocol. It delivers the same voltage rail and connector as the OEM cell. Capacity is 1000mAh (7.4Wh) — identical to the factory spec.

• GH2-series compatibility: All DMC-GH2 variants use the same DMW-BLC12 form factor, 7.4V nominal rail, and BMS handshake. One cell covers the entire range without modification.
• Bench tested on actual hardware: We ran this cell through the GH2 body under mixed stills and video load. The BMS accepted the cell on first insertion, reported charge level correctly, and held the cutoff voltage at the expected threshold under sustained draw.
• First-use charge cycle on the GH2: Insert the new cell and run a full charge cycle through the camera body or OEM charger before shooting. The GH2's battery-remaining indicator calibrates its voltage-to-percentage mapping during that first cycle — skipping it causes erratic percentage readings from the start.

Why the GH2 drains faster during 1080p video than photo mode

Continuous video recording on the GH2 keeps the sensor, Venus Engine processor, and in-body stabilisation running simultaneously. Still photography draws current in short bursts between shots. Sustained video pulls a steady load that sits well above the average draw during a stills session. A 1000mAh cell at 7.4V gives 7.4Wh of stored energy — that budget depletes faster when the processor and sensor never idle.

Battery percentage jumping in large steps on a new cell

The GH2 maps battery percentage against voltage thresholds calibrated to the discharge curve of its OEM cell. A new replacement cell may sit at a slightly different resting voltage for a given state of charge, causing the indicator to jump from 100% to 70% or skip the middle range entirely. This is a calibration mismatch, not a cell fault. Run two full charge-discharge cycles through the camera body and the indicator will track the new cell's curve accurately.