Its all very risky and only works some of the time.
Are you aware that lipos are never to be run flat? If so normally they are in the bin.
I know a shop set on fire doing excatly this. Got distracted and left too long.
The biggest issue is you let your lipo get over discharged, If you do not have a lipo cut off on your esc you must make sure you know how much current you are drawing in each race. and always leave a few hundred spare capacity.
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