Yes the both batteries had a serious problem with the cold temperature..
One of them was not used for many weeks so it had storage voltage (70%) i think, so i charged it the day before to 100% but still both batteries had some kind of problem during the flight.
One of them was not used for many weeks so it had storage voltage (70%) i think, so i charged it the day before to 100% but still both batteries had some kind of problem during the flight.