Time for an update. I'm still waiting on 4 more single cell chargers from Voltphreaks, and my replacement cell order has not worked out so far (I don't want to talk about it). Therefore, I currently have a 10s Headway pack, no BMS installed. I am discharging the pack 3-4ah only, then charging back up with a single cell charger. Some of these cells are taking more than 10 hours to charge up, I don't know why. Others will recharge in a couple hours (which is about what I'd expect).
Right now I've been reading a lot of threads on LiPO batteries. At first I did not want to go that way because of fear of burning down the garage and house. However, these cells don't seem nearly as dangerous as I first thought, and there just happens to be an old Weber kettle grill out back where I could charge them....hmmm. Also, it is fair to say I am thoroughly bummed with my LiFEPO4 experiences so far. My SLA powered LaFree has the charger and plug right on the bike. You plug it in, it charges the batteries - every year or two you replace the batteries. End of story. After spending at least $500 on my EV Headway pack, I've never gotten more than one 7ah discharge out of it. And, I've spent many hours tearing it apart, balancing, etc. etc. etc. Also, a used 24v 20 ah LIFePO4 duct tape pack I got from ES member Steveo gave me about 3-4 discharges to roughly 70% DOD before it developed a huge bulge on one side. (I was using this pack while working on the Headway pack.) So, I am not so thrilled with these things to this point. But, I'm just a bit discouraged, not giving up by any stretch. Once a stable pack is put together, charging, monitoring, and BMS issues have been ironed out, then the pack should be really nice - with long range, low weight, and many life cycles. In my case, that has not yet happened. It is really a great learning experience in the long run.
When I do get to ride my S-750, it is a nice improvement over my Giant LaFree. It is a lot of fun to ride and I like to go without pedaling sometimes. My goal is still to do 100 miles in one day before I turn 60 (> 1 year from now). I'm not limiting myself to one bike, one charge, or anything like that - 100 miles in one day, however I can do it is the goal.
Mike