I too had the same problem a few days ago, I used my multi meter to check a battery I had charged and load tested and it showed 19V, wot the!!!! I then tested it with my spare multi meter and the battery showed 12.8v nice........... (this is after a 100 amp load test) I then used the spare multi meter to check battery out of my main multi meter and the 9v battery showed 3v, replaced it with a new 9v battery, and all is well again
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