Andy has also developed a nice switch that you can charge the 2cell 123 pack thru. Also i echo what Woketman said, electrodynamics is on top of this 123 batt stuff and has everything you will need. I bought the cellpro4 from him and its perfect for charging these packs. I balance the cells at home before going to the field which takes a little longer. At the field i just charge to 100% and don`t balance, its so much faster that way. These batts are the best thing since 2.4 came in the hobby...ha !!!

V..