Once you perfect this method, you won’t ever have to buy C or D batteries again. This conversion is simple because all you need to do is increase the diameter of the smaller battery to fit into a device that needs the larger battery compartment. If that is the case, start over with a longer piece of cardboard. If the battery wobbles around, it may not have enough cardboard attached to effectively increase its size. The terminals should still touch the metal spring and clip on the device. A how-to sequence gives instructions on taking. The cardboard padding gives the "AA" battery a wider diameter so it will fit into a "C" or "D" battery slot. 984 subscribers Subscribe 171 Share 28K views 11 years ago The Gadget Guy demonstrates battery adapters that convert AA batteries to C and D. Test out your makeshift "C" or "D" battery by inserting it into a device that uses one of those types. When you come to the end of the cardboard, fasten it with another two or three pieces of tape. Make sure that the top and bottom of the battery (not including the terminal) are lined up exactly with the edges on the short end of the cardboard strip.Īpply two or three pieces of Scotch tape to fasten the end of the strip to the battery.Ĭarefully roll the cardboard strip around the battery, making sure that the edges of the cardboard stay level with the battery. Lay the "AA" battery on one end of the cardboard strip. Note: The length of the strip will need to be longer to convert a "AA" battery into a "D" size due to its larger size. The resulting cardboard rectangle should be the height of the battery by 12 inches (H x L). Use the scissors to cut out the cardboard, making sure to keep it the exact height of the battery. Measure and mark the cardboard to the identical height. Only measure the height from the widest point on the bottom to the widest point on the top. Do not include the round protrusion on top that is the terminal. Measure the exact height of the "C" or "D" battery’s external shell. Step 1 - Measure the Batteries and Cardboard
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