I bought for my Panasonic HDC-SDT750 just before holiday two interchangeable batteries of Blumax. They are in my opinion after 4 weeks a good and especially cheap alternative to overpriced original batteries. I can now on the final aging and life course, nothing to say (Which is why so far "only" 4 stars) but this will grudge when longer experience becomes available. First, the most important thing: A fully charged battery is in my Kammera in high film quality for more than 3 hours recording, or over 5 hours Monitor operation and corresponds to the information contained in the manual of Kammera for the original battery VBG260. These ads are also un reality roughly back. They vary somewhat logically depending on the recording settings and situation. In realistic mode (monitor mode & recording) which is enough for about for about 4 hours filming with net record for 2 hours. The only small criticism is the firstonce indicating Kammera After initially installing the battery "optimistic" battery life. But that will change after a few minutes, and then adjusts the display. So far I am satisfied with the replacement batteries so fully satisfied and would buy me at any time.