DMW-BLC12 Panasonic Lumix Compatible Battery 7.4V 800mAh

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

This 7.4V, 800mAh Li-ion cell replaces the DMW-BLC12 in the Panasonic Lumix DMC-GH2, GH2H, GH2HK, GH2K, and over two dozen other Lumix bodies sharing the same battery bay. It covers both stills and video shooting. Dimensions are 48 × 36 × 17.10mm — an exact physical match to the OEM battery slot.

• GH2 platform fit: Every model in this group runs the same 7.4V rail, uses the identical BLC12 connector, and shares a common BMS handshake protocol. One cell covers the full GH2 family without modification.
• Bench tested on actual hardware: We ran this cell through the GH2 body under combined load — continuous video, in-body stabilisation active, EVF on. The BMS accepted the cell on first install and reported charge state without error.
• First charge cycle on the GH2: Charge this cell fully inside the camera body or the Panasonic OEM charger before your first shoot. The GH2's BMS maps its battery-remaining display against a charge profile — skipping this step causes the indicator to jump erratically from the start.

Why the GH2 shows a dead-battery icon on a freshly charged replacement cell

The GH2 uses a voltage-threshold system to estimate remaining charge. A replacement cell fresh out of the box often sits at a storage voltage — around 3.7V per cell — which the camera reads as critically low or flat. The body hasn't yet mapped its discharge curve against this particular cell. Running one full charge-discharge cycle inside the camera teaches the BMS where the cell's actual endpoints sit, and the icon clears.

Battery percentage jumping around mid-shoot on the GH2 display

This happens when the camera's stored discharge curve doesn't align with the new cell's voltage output at mid-charge. The GH2 estimates percentage by reading terminal voltage against a fixed table calibrated to the original OEM cell. A replacement cell with a slightly different discharge slope will cause the readout to skip — dropping from 60% to 20% in a few frames, then stabilising. The fix is to fully discharge the cell in-camera to the auto-shutoff point, charge to 100% in one uninterrupted cycle, and repeat once. After two full cycles the readout stabilises. Target a full charge endpoint of 8.4V across the pack.