At what voltage is my 12 volt battery considered "dead?" Support December 10, 2020 19:08 Updated Follow A 12 volt DC battery is considered "dead" at 10 volts. Related articles If my battery is not charging , what can I try? How do I test the battery to determine if there is a bad cell? How long will my batteries last? How do I contact BLACK + DECKER customer service? Can I buy Black and Decker parts online? Comments 0 comments Please sign in to leave a comment.
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