Have you doing a calibration? I'm still in my 10 cycle break in period (running to 50% then charging to 100%) and have noticed a slight decrease in mah that I'm hoping will return when I calibrate.
All lipos will loose their capacity over time. As the pack ages its internal resistance increases and its ability to convert chemical reaction to power diminishes. What the DJI calibration procedure does is to take into account the aging of the cells and calculates how over time the pack capacity reduces.I had 5700 when new! Now down to 5136! That's 564 missing mah!
Where is my mah??
View attachment 5908
All lipos will loose their capacity over time. As the pack ages its internal resistance increases and its ability to convert chemical reaction to power diminishes. What the DJI calibration procedure does is to take into account the aging of the cells and calculates how over time the pack capacity reduces.
They have written the algorithms to take into account not only times, charged/recharged but also to what level of depletion the pack has been drawn down to and generally how it has been treated.
Having said that, their algorithms do seem a little 'over zealous' in how they go about calculating loss of capacity!
Of course, this would have absolutely nothing to do with wanting to sell more batteries.
I know, that's why I said it can be over zealous.Over time I can understand but twelve flights?
I know, that's why I said it can be over zealous.
Has that pack been 'abused' more than others?
I don't mean you have thrashed the hell out of it but has it been taken to low levels often or not stored at around 3.8v per cell or left for some time fully charged etc?
That might be your answer then.Yeah a bit. It's my fairly new battery I modified when new. I fly it to 10% and try not to store it full but I have 2 day discharge on it
That might be your answer then.
I'm not disagreeing!I think losing 10% capacity in 12 flights is DJI's battery racket though. That's tough to swallow.
I'm not disagreeing!
I always try to make sure I fly my packs only to a point that when rested they recover back up to 3.7v per cell. This ensures they stay as healthy as possible.
Assuming around a 0.2v rebound this equates to going no lower than 3.5v per cell under load (maybe 3.4 or just above).
I agree though, some mAh disappearance is too rapid.
LOL - I think my best is around 97% with around 20 something charges and around 91% with 40+ charges.What do you have for remaining capacity on your TB48's? That may help me feel better
All lipos will loose their capacity over time. As the pack ages its internal resistance increases and its ability to convert chemical reaction to power diminishes. What the DJI calibration procedure does is to take into account the aging of the cells and calculates how over time the pack capacity reduces.
They have written the algorithms to take into account not only times, charged/recharged but also to what level of depletion the pack has been drawn down to and generally how it has been treated.
Having said that, their algorithms do seem a little 'over zealous' in how they go about calculating loss of capacity!
Of course, this would have absolutely nothing to do with wanting to sell more batteries.
Unless there 'over zealous' algorithm also artificially reduces actual flight time before reporting low battery it doesn't seem to me to make much difference -- the battery is going to have the capacity it has and you will get flight times accordingly. So, during flight, if your warning is set to, say, 30% and the warning goes off when the real capacity is, say, 35%, then that would be bad, but I kind of doubt they'd risk the kind of bad press that would result if discovered.
Still, a reduction in capacity of 10% in 12 uses seems pretty high and would not have expected that much of a decline in less than perhaps 50 uses. I guess it somewhat depends on how low you run the battery on average and I'd surmise that not running below 30% would be better for pack lifespan than routinely running the pack down to, say, 15%.
Brian
Agreed, yeah. Brian how about yours? Can you possibly list some of your TB48's capacity numbers for comparison? Just trying to see if mine are out of the ordinary or if this is just typical.