Can you run lipo batteries in the blast?
The stock ESC doesn't have Low Voltage protection for LiPo batteries.
The Stinger motor would also likely get extremely hot with the run times that Li-Po batteries can provide.
That said, you could get a standalone voltage alarm; however, that could be hard to monitor when the boat is out on the water and the alarm is sealed up inside the hull.
"Happiness depends upon ourselves." -Aristotle