Hy
I Charge my A 123 with a old version of the Orbit Pocket Charger ! I have two 4 S Packs, put toghether to a 8 S and I charge the 4 S A 123 Packs with the normal PB Battery 12 v Programm !
i have done this now a many Times and the cells works pretty good ! I know from some other Guy´s here in Germany, doing this the same way !
The new Orbit Chargers have allready the LI/FE Programm !
So what I wanted to say is that you can charge the 4 S Pack in a very normal charging Programm ( PB 12 ) with any Charger !

good Luck Stefan