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There have been lots of threads on batteries in this forum. Use the search feature.
As for using your 9V for the fish finder, it will probably work for a short period of time until the voltage drops to about 8.5V which is the minimum that my FF will work at.
You would be much better getting a 12V. There are lots of other sources that offer more variety and better pricing than the Shack. You can also make your own 12V source by using a bunch of AA rechargable batteries.
Kits and waterproof boxes are available at OEX .
Bob
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