I've always had deviations in cell number 3 , I finally got a second battery and it too has deviations only in cell number 3 -- thoughts .
This is something Ive been wondering about myself.
I have 3x M2 packs, manufactered around 7/2018. The first 2x packs have about 70-80 flights and the 3rd pack has about 40 flights.
On all 3 packs, the 4th cell is the only deviator, sometimes pushing .08v, but on a sport mode climb or heavy wind, however airdata doesnt flag them as bad probably because its only sporadic events and not sustained deviations, but its always cell 4 shown as being close to problematic.
The attachments are from airdata and have been this way on all packs pretty much since my first flights... Just makes me wonder if my AC draws a bit more from cell 4 for some reason, or all my packs are from a lot that maybe has a slight offset, however the charge and discharge voltages, at rest, all come pretty close to each other, with the resting voltage of cell 4 starting to diverge as my packs get older.
My guess is Im looking at it a little too critically, but maybe some of you can comment on what your thoughts are!
Ive been very very kind to these packs, charging to 50-75% after flights, butbonly after well cooled, and storage alwaysbin 70deg room temp. Same with all my lithium batteries (on other types of gear, aka diving dpv, etc), and Ive never see cell divergence that starts from the beginning like this AND which is the cell showing issues on multiple separate packs.
But, I am glad theyre still flying, 70+ on a pack is getting to be where Im happy with their lifespan...
What sort of life cycles have you guys seen on your drone packs?