I have a Thunder Power 820CD that I would like to use to charge my A123s. My batteries all have a JR connector balance lead as I have been using a Celpro 4 charger. The TP charger will allow me to balance the batteries when I need to. I have thus far been unable to devise a way to charge the batteries using the 820. I build a lead that would plug into the 820 and that didnt work. I then used the main leads just a I would with a LiPo battery...that didnt work. Called TP and they couldnt help. Anyone have any ideas?