About this replacement
Panasonic Lumix DMC-TZ1EG-S Series — 3.7V Li-ion Replacement Battery (CGA-S007)
This is a 3.7V, 1000mAh Li-ion cell built to replace the CGA-S007 battery in Panasonic Lumix compact cameras. It fits the DMC-TZ1EG-S and a wide range of TZ and DMC-series bodies. Physical dimensions match the OEM cell at 36.95 x 30.10 x 12.35mm, so it seats fully in the battery compartment without modification.
- TZ and DMC-series compatibility: These bodies share the same battery bay dimensions, 3.7V power rail, and CGA-S007 connector footprint. The BMS in each camera reads cell voltage through the same contact arrangement, so one cell works across the full TZ1, TZ2, TZ3, TZ4, TZ5, and related DMC lines.
- Bench tested on actual hardware: We cycled this cell through the Lumix BMS and confirmed charge acceptance, full voltage delivery at 3.7V nominal, and clean cutoff at the low-voltage threshold — no erratic shutdown mid-session.
- First-use charge cycle on TZ-series bodies: Run the first charge inside the camera body or OEM charger before shooting. The TZ-series BMS maps battery-remaining percentage to the cell's discharge curve during that initial cycle — skipping it causes the indicator to jump or read inaccurately from the start.
Flash capacitor recharge sag at low cell charge on the TZ1EG-S
The TZ1EG-S flash circuit pulls a short high-current burst to recharge the capacitor between shots. As cell charge drops toward the lower end of the discharge curve, internal resistance rises and the voltage briefly sags during that recharge draw. The camera body may flag a low-battery warning or slow the shot interval even when the indicator still shows charge remaining. If flash recycle feels sluggish, check cell voltage — below roughly 3.5V under load, the sag becomes noticeable.
Battery percentage jumping erratically on the Lumix display after fitting a new cell
This happens because the camera's fuel gauge maps percentage to a discharge curve calibrated to its previous cell. A new cell with a slightly different discharge profile throws off the voltage-to-percentage translation at mid-charge levels. The indicator stabilises after one or two full charge-discharge cycles, once the BMS has mapped the new cell's actual curve. Charge to 100% in the camera body, shoot until the camera shuts off, then charge again — the readout should track accurately from that point.