Metz 9745 Flash Replacement Battery 6V 2100mAh Ni-MH

Metz 9745 / 9747 / 9748 / 9783 — 6V Ni-MH Replacement Battery

This is a 6V, 2100mAh (12.6Wh) Ni-MH replacement battery for the Metz 9745, 9747, 9748, and 9783 camera flash units. It slots into the battery compartment of these flash systems to restore full power output. Capacity figure is taken directly from product data — 2100mAh at 6V nominal.

• 9745 / 9747 / 9748 / 9783 compatibility: These four Metz flash models share the same 6V battery platform, physical form factor (89.10 × 46.50 × 19.10mm), and power draw characteristics. One cell spec covers all four units without modification.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge under flash-capacitor recharge loads. The cell held voltage above cutoff through repeated rapid-fire sequences without triggering premature BMS shutdown.
• Flash unit charge cycle on first use: Insert the battery and run a full charge through the OEM Metz charger before the first shoot. Metz flash units map their charge indicators against a known discharge curve — skipping this initial cycle can cause the indicator to misread remaining capacity mid-session.

Flash not fully recycling between shots on a new cell

Metz hammerhead and bracket flash units pull a sharp current spike each time the capacitor recharges after a burst. A new Ni-MH cell that has not been through a conditioning cycle can show elevated internal resistance in the first few charge-discharge passes. This causes a brief voltage sag during capacitor recharge, which the flash interprets as low power — slowing recycle time. Run two full charge-discharge cycles through the OEM charger before judging recycle speed. After conditioning, the cell's internal resistance drops and recycle lag typically resolves.

Battery percentage jumping erratically on the flash indicator

Metz flash units map their charge indicators against the discharge curve of the original Ni-MH cell spec. A replacement cell with a slightly different discharge curve causes the indicator to jump — reading high, then suddenly dropping. This is a calibration mismatch, not a fault with the cell. Charge the battery fully in the OEM charger, then allow it to discharge naturally through normal flash use. After one or two full cycles, the indicator reading stabilises against the new cell's actual voltage curve.