Re: Need advice: cheap fishfinder
Cabela's has the Eagle Fishmark 320 for about $100 right now. They also have a small 12V battery on clearance that would work well for a fish finder, but it's kind of spendy. The battery looks like a UPS (battery backup) battery that you could get for $25.
If I needed a small battery to run
just a sonar, and needed a battery, and charger. I think I would buy a small UPS, which contains a battery and is a charger. Remove the battery for fishing and reinstall the battery to charge it back up again. Heck, if it wasn't for the UPS not being waterproof you could probably just tap into the battery and leave the thing assembled and go fishing, then plug it in when you get home... Thinking outside the box a bit
(Oh yeah, the UPS would have to contain a 12v battery...)