Agree with Brian - Have a 21v that threw the "check engine" error due to low voltage, which i thought was 11.3 on my boat. Your boat computer is like a windows computer - it needs some battery to gracefully shutdown, store engine run time, and other factors into memory. likley you'll have an alarm at the first stage and if it drops lower, around the 10.2 mark, the engine may shut off so the computer can shutdown (with some battery life to protect it). not sure if all boats have the engine shutdown limit or what the voltage is...but that is what mine will do.
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