I bought two 12v 50ah Lifepo4 batteries and a 30a MPPT a year ago for a project that never happened. They have sat, forgotten, until now. I checked the voltage and one at 13.2v and the other at 12.9v. Can I use the MPPT to charge the batteries from the cheap dumb charger? There are no smart or lifepo4 chargers available here.