I have a 10+ year old 12 volt Makita power tools, and about 5 matching batteries (two being fairly new), of which none seem to work anymore. I think it's a problem with the Makita charger (DC1414), however, when I put a battery in it, it lights up red (like normal, meaning it is charging) for about a half hour or so, then turns solid green, which normally means it is complete. Unfortunately, when I take the battery out and try to use it, it doesn't have any charge.

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I check the battery with a volt meter, and indeed, it is still dead. Is the battery charger broke, and if so, can it be fixed? How can I test the charger with a standard volt/amp/ohm meter? Or should I just get a new one? • 3 Answers SOURCE: When Li-Ion batteries are discharged to a too low voltage (below 2,75 V/cell, in this case 13,75V) the charger will assume that the battery is damaged, and will not charge the battery. First measure the battery voltage with a volt meter, if the voltage is significally below the 13 V the battery are no good.