Hey, be careful with those cell phone chargers. Someone destroyed his lifepo4 with one of those. The reason being, a lot of times those aren't really chargers but just power supplies and the cut off voltage chip is inside the cell phone so it just supplies current to the cell phone and if you leave it on the battery it'll just keep supplying current until the battery is destroyed. I wouldn't use one of those unless you at least monitor the first time and make sure it shuts off.

I haven't balanced my cells for about 4 or 5 uses so it's okay if you go a few times or several times without balancing them.

There is a 3.2v 2amp lifepo4 charger at all-battery.com. That's what I use to top mine off. Here is the one I use. I bought 3 of these.
http://www.all-battery.com/TenergyLi...rger01300.aspx

I use a 12v black and decker for my main charger. Not sure if you knew that or not. I charge 4 cells at a time. I can get them all charged in 3 hours or less. Not bad.