[Sergio]

Just disconnect the pack negative cable for more than 10 minutes.

That will erase any information the OBC has about the "health status" of the pack and it will run an "analysis" charge cycle the first time you charge, that can take several hours.

Once the OBC has determined that it has enough information about the "health" of your pack, it will start using the amount of energy used since last charging cycle to calculate how long it needs to charge.

It is important that the pack negative cable is the only connection on the pack negative battery post and that the cable runs through the opening in the OBC.