LiPo's are 3.7v cells and can get charged up to an absolute max of 4.2v per cell
over this and damage starts to occur
LiFe's are 3.3v - put them on a LiPo's max 4.2v and you will overcharge them - not good and risky
The B6 has a lipo setting that you adjust voltage from Lipo (3.7v) to LiFe (3.3v)
HobbyKing sell GENUINE B6's for about £20 - (get a genuine one than a £15 clone)
psu - if you wanted to save a few quid then a decent laptop psu will work:
http://www.ebay.co.uk/itm/Genuine-IBM-Lenovo-Thinkpad-08K8203-72W-16V-4-5A-Power-AC-Adapter-Laptop-Charger-/400423702601?hash=item5d3b1cd049
BLIMEY - some greedy bastid just bought 57 of them and now these £4:50 IBM / B6 chargers are all gone !!!!
Actually it don't matter too much - the psu you need is a 12 to 18v but needs to be a decent amperage
The above was a 4.5a 16v, 1 or 2amp is too low - needs to be about 3amp plus up to 5amp max
(these chargers can boost charge hence they need some juice)
You should get the 5.5mm / 2.5mm dc plug in the box, so can splice this onto a laptop psu
or buy a universal laptop psu with a few different connectors like I have done
That is if you know what you are doing and have test meter to double check polarity etc...
If you are not sure then buy a PROPER B6 psu charger at about £12 or so
search loads of lipo / charger posts - I've said loads of crap recently with links n crap
so not gonna repeat it all over again n again
just don't charge life's on lipo settings !!!! - not wise to overcharger these mofo's