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It was a faulty connection on the lead. Thanks

I'm in the process of building my first 12v lifepo4 battery but the BMS test is rather concerning. My leads test fine at 3.3, 6.6, 9.9, but when I test the last lead my meter goes crazy! I'm hesitant to go any further until I have the issue cleared up. Any suggestions? Tia

Is a BMS required for both batteries if hooking a diy battery to the same parameters manufactured battery with a BMS?

Are two 12v 100ah batteries in parallel the same as one 12v 200ah battery?