Fully charged they read: Cell 1 4.21 v Cell 2 4.07 v Cell 3 4.04 v I should also mention that my batteries are wrapped with electrical tape, they wouldnt make contact when wrapped. I think what is happening is cells 1 and 3 (the back ones) aren't getting the best connectivity. I didn't get a chance to mark the odd battery out last time (WAS in cell 2) but I assume it's now in cell 1. I won't know if I'm correct until I try another charge, if 1 and 3 lag behind again I think it's safe to assume that's it. One more question I'd have is how I can wrap these batteries WITHOUT messing up the connection, as chamber on the reuleaux is really tight, paper maybe?