If the voltage is coming right back then I'd be looking really hard at all the connections. Use an IR thermometer if you can, measuring before and after a good run of the thruster. Connections can appear good, but be problematic, especially if old. Don't overlook the lugs on the ends of the cables. They are just crimped on and can corrode over time.
By the way, where are you measuring the 10V? Is that at the battery? The thruster? Somewhere else?
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