9 Volt Battery Hack
thingiverse
Give new life to your old 9-volt DC battery casing and terminals instead of tossing them out. To create a reliable 12V power source, stack four CR2032 coin cells together in series first. Next, place two sets of the series-stacked batteries side by side in parallel for consistent voltage output. This setup works well for powering LED strips, G4 bulbs, or any other device that demands high-quality batteries, with nearly 2,000 milliamps per hour at your fingertips. Don't confuse this improvised power source with a regular 9-volt battery. Take note that the CR2032 Coin Battery measures exactly 20 millimeters in width by 3.2 mm in thickness.
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