The replacement battery is working properly with my Lumix TZ 7 with firmware version 1.2, but it holds only half as long as the original battery. Therefore, I would (even if it is so expensive) prefer to buy the original battery. Was just on holiday, have just made in sightseeing many pictures, of course zoomed lot and some flashed. Since the original was sometimes depleted in half a day, sometimes not until after a day; However, the replacement battery must be held only after 2-3 hours each. Clearly there is an exceptional situation for city trips, etc., but even more important to have a longer lasting replacement battery, as you may in the evening can recharge in the hotel rooms.