The PowerFLARM doesn't have a battery. It gets the date from the GPS unit. As long as the flight log filename date and the date in the flight log are correct, you're all set.

Best Regards,

Paul Remde
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On Tuesday, May 7, 2019 at 1:19:58 PM UTC-5, wrote:
I have a Portable PowerFLARM, and it creates IGC flight log files with the right dates (from the GPS data), but files that it writes to the SD card are all dated 1/1/2010. Has an internal battery for the real-time date died, or does it not have one?