It only unlocks the battery when it's on, it only charges when the battery is on, and it only calibrates cells when the battery is on.
I also noticed that when it's off, it tells me the cell difference is 48 MV, and when I turn it on, the cell difference is 150 MV.
Can I try calibrating and charging while keeping the battery on?
Thanks.

@laarnova 

Yes. Try to calibrate the battery when it's on.

@loliconic The problem is that the difference in cells increases with calibration, now the difference is greater

@laarnova 

Probably, your cells are very bad and have different internal resistances, and that's why the imbalance is so big.
Can you do a cell check and paste the result here?

@loliconic Hi, I'm now trying to do the balancing with an Imaxb6 and it doesn't seem so bad, but when I put it back in NLBA it tells me the difference is 70 MV.

@laarnova 

Please perform a cell check when the battery is charged between 30% and 80%.

@loliconic Ok now I'm calibrating it but when I finish I'll do it, thanks

@loliconic Is the calibration that slow?

@laarnova 

Perform a cell health check before starting the calibration. If the cells are degraded or faulty, the calibration process will be ineffective and pointless.

Posted by: @laarnova

Ok now I'm calibrating it

 It is useless step if cells are faulty. 

 Cary out Cells Check like was suggested and SelfDischarge check to figure out cells condition. 

@djibattworkshop Hello, thank you for everything, the battery is working and has already been tested on the phantom.

As always, your after-sales service is excellent.