MP/QUENTIN,

I'm glad your discussing the power/weight options between the AA Lithium packs and those 12volt drill packs.

I'm in the market for a new cordless drill. I see Ryobi has some 18volt rechargeable batteries/charger that you can retrofit previous models with. They have a long life model/and a compact version as well.

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I also see that some of the fish finders will handle 20 volts.
I see there rated at 4Ah which if I understand right is equal to about 4000mAH, is that close?

They're considerably more powerful than the 12 volt and have a built in battery level indicator which might be a nice feature.

Weight is always a factor, but I read where you have to be careful how you re-charge those AA so you get maximum benefit.

I like the idea of getting dual use out of something.