I saw this over at Lifehacker and I couldn't resist posting this on mine as well.
If you're looking for AA batteries but don't want to spend hundreds of dollars yearly to power your gadgets, this is the perfect hack for you. Trim down your spending by hacking into a 6 volt battery, which typically costs about $5. Just open the casing and you'll find a whopping 32 AA batteries. Considering that you can get 8 watch batteries from a 12 volt battery and 6 AAA batteries from a 9 volt battery, this isn't surprising, but since AA batteries are the most popular among the three, this should yield considerable savings.
[Lifehacker]
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