How To Be Sure Your Batteries Are Dead Before Tossing Them Out
9V for 9V batteries). Firmly attach the red multimeter lead to the battery's positive side and the black lead to the battery's negative. Make sure they're in contact with each other to get a good ...
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How To Replace the Battery Terminals in Your Car
For best results, always use a new 9V battery to power the memory saver. First, determine the positive and negative terminals. Then remove the negative terminal clamp from the battery post first.