re: Fishfinder set-up for the kayak - Let's see yours: UPDATE IN OP w/ PICS

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What kind of run time do you expert to get from that battery?

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According to the user manual, PEAK power consumption is 4.3W.
At 12V, that means power consumption is 4.3/12 = .358 amps.
With a 6000mah (6ah) battery, I'll get 6/.358 = 16.76 hrs.
Since you're only supposed to discharge to about 80%, I'll call it about 13 hrs at peak power consumption.
Since I assume average power consumption will be around 2/3 of peak at the most (and likely far less than that based on some tests I've seen run on other depth finder's average vs published power consumption), I estimate about 20 hrs of run time.