Ignoring for the moment the weight factor, you can get a 7ah 12V battery online for less than $20 delivered. Yes they weigh a lot more than the little batteries but they last much longer.
Personally, I don't think about the weight that much. If you are worried about it, leave the beer at home. Most kayaks can easily handle a load of several hundred pounds.
If you get lucky and have to transport a bunch of 60 pound fish, you might have a problem but I doubt that going with a lighter battery would make much of a difference.
Bob
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