Be sure to follow the thread that talked about motors that potentially have shorts in them if you only see crashes in water. Given the first data set does not capture anything that looks out of the ordinary I would definitely do that check first. I am assuming you are using the trustfire 26650 3.7 Li-Ion batteries. As far as what is in the data sets:
The first data set, I don't see anything out of the ordinary. I can see that you were telling the system to go full bore and it was in the process of ramping up to speed via the motor target vs actual (mtarg = 2000,1500,2000 motor [actual] = 1835,1500,1835). Battery currents (BT2I,BT21) look normal. As does the battery voltage BRDV of 11.14.
For the second data set, you were pulling current from only 1 battery tube (BT2I = 0, BT1 = 7.22). You batteries were showing 10.26V at the time the last data set came in. Usually we can draw down to ~9.5V with the Lithium batteries we have been using before the protection circuits kick in. But the current and voltage are only coming in with a 1 second resolution so the voltage may have bottomed outside of the sample point.