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As far as using the 18 V for a detector I like the 4 Ah, don’t know about weight but I do not like the 18 volts.  Quentin’s 12 volt batteries supply power in the voltage range that detectors work well in.

I couldn't find weights for the 18v. I'm sure there posted somewhere but I doubt there lighter than a 10aa battery pack, but if your taking 2 of those and 1 18v pack would do the job, it might be a fair trade-off?

I looked at a few different low end fish finders.
At least two of them had the high rating at 20v.
I did a little Googling and some people say those high end voltages are deliberatley set lower than the unit could take if you had a spike in current.
Your the electric guru, so I would take your feelings into account IF I ever decide to go that route?