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How to apply your coupon code

For a flashlight, you want high discharge rates (3.7V-4.2V) and lots of maH (more than 1500). These things aren’t necessarily easy to find on common cell boxes, but you can find them if you need to. Most alkalines are 1.5V. Most camera batteries are 3.0V. Rechargeables are necessary to get those really high numbers.

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