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I would make sure you display your input voltage on your fish finder so you don’t discharge down to far. Most manufactures am have safety’s built in where if it’s over discharged the charger will brick the battery.
Heavy lead acid batteries. And a desire to build something lead me to this. Plus I haven’t been fishing enough to justify a 100-200$ dedicated battery. But I do already have a ton of makita batteries that I use regularly. Figured might as well build it.
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