I use Cellpro 10S and a 10XP and have no issues. As long as the voltage is correct, which it will be if you select A123, use your balence lead and set an amp rating in which to charge, autopilot from there on out. I've also used other chargers LiFe function to charge A123's but I honestly prefer the cellpro. Had them for a long while and they keep on ticking.