the problem with todays crop of cells id they discharge so fast when just sitting there so when you buy you spanking shiny new world spec cells, they may have been in the box for 2 months=DEAD!!!
I got sent some cells from shuey at the start of the season, this was followed by an email from them, build and charge you cells immediatley
Schuey are small compared to orion etc so there cells sit on the shelf for a little less time. so my theory is to buy from a smaller matcher, ie schumacher, demon etc.