This is "an official statement":
"When not in use for 10 days, Anafi’s smart battery discharges itself, if required, to 65% charge, over a 48h period. "
Under "wintering mode"
[URL unfurl="true"]https://www.parrot.com/global/support/products/anafi/how-maintain-battery-anafi[/URL]
And all my 3 batteries did that before this way