I'm using a Raymarine Dragonfly 7pro powered by a 12v SLA battery. I get about two full days of use out of it before I get a warning message on the third day.
The SLA is heavy as all-get out, but it actually helps balance my boat out nicely on the water (I put it in the nose of my Ride.)
I echo the suggestion to start out with a smaller, more basic unit. You can find good 4" units like a Lowrance Elite 4 or the smaller Humminbird for just a few $$. Learn how to use it, then upgrade as necessary. The larger models are easy to get lost in the settings and options....
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