Agree with what Thorne said.
Having an owners manual is so important when it comes to upkeep.
Google would be your second best bet.
Just a caution. Check your owner's manual to see how big your alternator is.
Is your alternator putting out enough juice to replenish your battery? If you're not travelling far on the lake you may be slowly depleting your battery. ( even with a sonar that doesn't draw a lot of amps )
Safest bet is throw it on a charger after a trip.
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