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JDB SP04S034-200A BMS SOC always show 0 percent

LFP addict

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This is the third BMS wich only show 0% SOC. All :JDB SP04S034-200A

When i use the admin app to configure settings, i can change :Cell 100% Cap. Voltage to another value and right SOC % shows again.
After a while it jumps to 0 % again.

On my first encounter I discovvered when unconnecting a positive lead resulted in 0% SOC @ 13,4v with a 4S pack. Changing a value in the 100 -or 80% value did bring the right SOC back. This not always works. Could it be a faulty connection in the leads ? Must be others with this problem... (on a JDB)

jdb soc 0.JPG
 
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