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you can easily test batterys that you have by licking it. It sounds a little crazy but it works, it wont give you a shock just a little tingle because its only dc current although i wouldn't suggest testing it on something like a car battery just the small ones you can find at the store like 9v or 1.5v. One last thing don't hold the battery on your tongue to long or i predict it will eventually start hurting.

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