I use a 20Ah, 48V eBike battery and custom built electric outboard to push my 23' sailboat around (a 2500lb?keelboat) and use Anderson connectors. You can also get rubber 'boots' for the connectors?to help protect them (I use these and can recommend them).
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I have also tried a Hangkai with my boat and it worked well, though the throttle was awful (very sensitive). I cobbled?a fix, but beware.