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I think you are both right. The used laptop batteries was a test build just incase I made an error. I have other new unused batteries which have a 2500mah rating. Today I built a 14s 7p battery with them in the same way I did for the laptop batteries and it works a dream. I think it could be...

That could be the problem. Each cell group is around 3.8v I think there is one or two which are at 3.65V. I think the problem could be the 13th or 14th BMS wire. When you say tap off, are you saying cut it off? At the moment the 13th and14th wire are welded together. It was just something I...

Cheers dude much appreciated. Thanks for your help.

Can anyone help? I have built my battery from used laptop batteries. It is approx 14A 48V battery with a 14s BMS, but I only have a 13s battery. When it was built the battery was showing 43V. I have charged it up but now something really confusing has happened and I don't know what. The...