Either get a cut off, or pop a timer on your Tx.
I only run (about) 10 minutes at a time anyway. As everything starts to cook. I need around 20 minutes to reach the (3.2v) cut off in my 2wd.
Brushed makes it a little less predictable........
Try running for 5/10/15/20 minutes and popping a multimeter across the pins to give you an idea of remaining power. That'll give you a handle on running time.
(And apparently you need a regulator to run that ESC with lipos, its only rated to 7.4v, not 8.4v.)
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