As said speed cell only make the assembly of the cells but they didn't finish the job as they should.
The A123 cells need to be balanced once or twice a year in order to get the maximal efficiency, for this the pack need to have another connector that support a voltage balancer device
http://shop.durbahn.de/shopimgs/456.jpg
this will connect to the cells directly and level the voltage between them
in the picture you can see the extra connector and to it attached a small display that do a voltage test to all cells.
http://img2.timg.co.il/forums/1_131721304.jpg

Any body else installed A123 cells? I am still wondering how long they last and is the 4 cells are enough for this motor?

is there somebody who realy tested these battery�s?

saving 3kg with the 4dell battery sounds just nice, but will it work every day and even in could weather and so on...?