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I was charging my 12V 7Ah battery with a car charger and only getting about 50% capacity or about 3 hours on the FF on a full charge. Switched to one of the small chargers designed for the small batteries and now I get 6 hours plus on the FF (color GPS). Fishfinders are designed with a low battery shut off usually between 10 and 11V, so they will shut down before the pump will. The pump will continue to run below 10V but you will notice it start running slower or has less power the lower it gets. Good luck with it.
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