Have same unit and just ran a time test last night on the new battery (lead 12 volt, 9amp) Lasted from 10:00pm till 1:00pm the next day.. I'm sure it won't last as long on the water if I keep playing around but that gives me a good sense of how long it should last which is way more than expected.
Screen was set at 4 as don't need it that bright anyhow.. $25 bucks and can stores nicely in back of kayak in the useless hatch..
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