How would a coulomb counter risk the battery?
I'm not saying your specific installation is risking your battery. I'm saying, from what I've learned from others, that you can't just drop in an a DIY LFP battery and expect it to charge from your alternator without making some changes.
I could be wrong here, but my recollection is that the LFP will cause most alternators to overheat trying to keep up with the electrical load of the LFP because it will take as much current as you can give it. This could also result in a fire with overheated wire from the alternator to the battery.
Edit: I forgot to add the risk to the battery in the above scenarios. Who knows what kind of horrible electrical surges you might get from a failing alternator, plus a fire risks everything.
