Need Help With Battery Sag

Hi All, I’ve got a Meepo Hurricane that was cutting out and turning off in Mode 4. The board now has no response in any mode but is still connected to the remote. Meepo says its a battery problem and I’m guessing it’s battery sag as it was only happening in Mode 4. There is also now constant resistance to the motors even with the battery unplugged. Any chance anyone knows anyone who might be able to have a look? Much Appreciated

This usually indicates a blown motor controller, but could also mean bad motors. Look up “how to hand test a BLDC motor” and try that first.

Thanks for the response, any chance you’ve got a link to a specific example as I’m finding different ways of testing them