BMS not showing correct voltage FIXED, DIY battery basics with BMS explained, / 4S-4P 18650

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Tools and parts :
-BMS 4S : https://amzn.to/3ZJcxeJ (with voltage stamps)
or https://amzn.to/3PNxwZf (with letter stamps)
-BMS 3S : https://amzn.to/3rKzku7
-Nickel Strips : https://amzn.to/3LR4y9z
-Spot Welder (seesii) : https://amzn.to/3F8tndy
-18650 cell holders : https://amzn.to/46kw5Zr
-MultiMeter : https://amzn.to/48LoKDS

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