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Hi Hans,
Thank you for your feedback. But my battery is new, it is only a month old and while the first days it recorded for over 5 hours, now after only a month it records for only 3 hours. Unfortunately it is not a problem of temperatures, I carried out the test by starting the recording at home at 20 degrees celsius and recorded for 3 hours and 25 minutes. A battery that degrades by 40% after only a month I think is a defective battery