Who needs solar when battery level goes up even without the solar unit installed 
a new set of batteries and temperatures going up ? Or did you fiddle some USB link ?
nope, batteries are almost a year old. But just before it ran accidentally a few day without powersave, which drained the batteries (from 3.36 to 3.12). I would suspect temperature, but there is no obvious correlation (average temp feb 7.2, average in march 6.8). Don’t worry, Voltage will drop sometime in the future.
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