question

What LiFePo4 battery are you using with the 12/200? You say that the control wires are not connected up? This will mean that the BMS cannot communicate with the battery. If the BMS cannot communicate with the battery LB will not switch on as a safety measure to protect the battery.

Sorry, but that BMS is designed to work only with Victron batteries.

Each battery manufacturer users their own BMS. Your dealer or whoever you bought the equipment from was supposed to tell you that information.

Oh but if it is true is a joke...so if I need a lithium battery in some place of the world where there are fiction battery I'ok be out of play?

That product is a BMS. It is a Victron BMS, so it is designed to work with their own batteries only.

Other batteries in the world have a BMS already inside, some other ones have no BMS at all.

I can sell the bms 12/200 and buy a victron Agrodiode to charge and use my LiFePo4 battery with the alternator? My batter has inside its bms. How I can limit the charge current at maximum 50 Ah? The alternator of my ford transit 2014 work until 150 Ah but the charge current of the battery is max 50Ah.

Thank you

The Argodiode will not be able to limit charge current. Your charge current would be limited by the alternator, maybe too much current.

You could use a Buck/ Boost DC-DC converter, then you can limit the current and choose Lithium battery options with the software. You can connect the output directly to your battery, then your battery's internal BMS can do the protection.

https://www.victronenergy.com/upload/documents/Datasheet-Buck-Boost-DC-DC-converter-25A-50A-100A-EN.pdf

Check out this video, these gentlemen are installing one in their van.

https://www.youtube.com/watch?v=vCOJ3nBFpIM

The alternator of a modern vehicle already limit the current for the motor battery. A LiFePo4 is not a Lithium battery and it can be charged normally with the alternator.