Mihai_F
100 W
- Joined
- Oct 11, 2021
- Messages
- 130
Hi there,
I managed this weekend to get one more flight (30min) out of my battery (21s left), it held 14 to 12kw for 4minutes, then 7kw for almost the rest of the flight. All monitored parameters ware in spec, and about toward the end of flight, all cells reached 3,3v to 3,4v about the same time. Then in about 30 seconds, i could feel the power was fading slowly, a cell (no15 witch was near to no14 that leaked and previously died this year) went almost to 2v, all warnings went on, i overwrite the "safety cutoff" (i knew that the cell is done, no recovery), restarted and then with reduced power turned for a landing (i was in a traffic pattern all the time to be safe and close to the runway), during the last 2 minutes, till on the ground, it wet to 0 volts and stayed 0V even the next day, so completely obliterated. I'l come back with pictures of the yet another dead cell, most probably got corroded like the last one. A note is that at 22s i could get 16Kw max last year, at 21s i got 14kw max this weekend, but from now at 20s, 12kw is not enough for initial climb out, at least not a safe one, at 14kw it felt marginal... I could split the reaming 20s in two 10s banks and use for my ground based projects and squeeze the remaining life out of it.
I managed this weekend to get one more flight (30min) out of my battery (21s left), it held 14 to 12kw for 4minutes, then 7kw for almost the rest of the flight. All monitored parameters ware in spec, and about toward the end of flight, all cells reached 3,3v to 3,4v about the same time. Then in about 30 seconds, i could feel the power was fading slowly, a cell (no15 witch was near to no14 that leaked and previously died this year) went almost to 2v, all warnings went on, i overwrite the "safety cutoff" (i knew that the cell is done, no recovery), restarted and then with reduced power turned for a landing (i was in a traffic pattern all the time to be safe and close to the runway), during the last 2 minutes, till on the ground, it wet to 0 volts and stayed 0V even the next day, so completely obliterated. I'l come back with pictures of the yet another dead cell, most probably got corroded like the last one. A note is that at 22s i could get 16Kw max last year, at 21s i got 14kw max this weekend, but from now at 20s, 12kw is not enough for initial climb out, at least not a safe one, at 14kw it felt marginal... I could split the reaming 20s in two 10s banks and use for my ground based projects and squeeze the remaining life out of it.
