What causes an ESC to fry if batts are left connected?

[Pdelcast]

Originally Posted by BrianG

So, no word from Castle on this? We can all speculate, but it would be nice to get an expert's point of view...

As said, it's not just a Castle issue, but something that can happen to various ESCs.

Honestly Brian -- I don't know. We test our ESCs all the way down to 0V, and I've personally never heard (before this) of an ESC failing when left connected to a battery.