Cuda 350 s/map on a 12v 7amp battery lasted me about 18-24 hours total run time. That thing ran forever.
Lowrance HDS-5 only lasting 6-8 hours. Just upgraded to a 9amp battery and expect to get 10 hours.
If you are running a b/w unit you should get plenty just like the old cuda/350. It's when you go color that you get much less run time. The GPS and sonar are relatively low power compared to the screen.
I don't remember a voltage overlay but you should take a look in the settings and see if you can add it.
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