quotFREEquot DIY Battery Tester

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Here's how to make my (nearly) free battery tester for your wallet or mini tool kit out of a dead battery, tape, and some aluminum foil. It's effective yet so small so you can carry it on you every single day. I plan to keep one in of all of my mini EDC tool kits. • Duracell's FAQ page warns: Do not dismantle batteries. When a battery is dismantled, contact with the components can be harmful and may cause personal injury or fire , so I don't recommend this device for children. Disconnect immediately after each use and do not use if wet. • Duracell explains how their Powercheck technology works here: • Video • Remember to test at room temperature, 70 F/ 21 C, for the most accurate results because this device is actually measuring heat created by the resistive strip under the multi-colored thermo-sensitive crystals. If you can't find these batteries locally you might try BestBuy, Walmart, Amazon or ebay.

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