Well, sure, but Sanyo Eneloops are $15 for 4. Even name-brand rechargables at the same stores are $8.99 for 4 right next to them. That's like double the price, and it costs almost nothing extra to make these.
It's not a huge deal if you have 4 or 8 of them, but I have dozens of AAs in my fleet.
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Work: the 8 hours that separates bike rides.