Because I wasn't able to fly for 2 weeks I have tested all 7 batteries because they were discharged to 50%. 6 TB 48 and 1 TB 47 were tested. Tested all batteries 5mtr(20ft) away from me and about 3mtr(10ft) altitude.And I was surprised that ALL batteries came at a point to go down from about 40% to less then 10% in a few seconds! So this makes me clear that you always charge batteries to 100%! It has said here before on more threads,and I go out with all batteries at 100%,but I was surprised with the result.