If the lipos need to be BRCA approved then there is the list,
http://www.brca.org/BRCA/elecboard/n...%20List%20.pdf
for saddles first make sure they will fit in your car, we use the vampire cells in both a D4 and an X6 (also takes a stick pack), love em.
You need a dedicated lipo charger, do not charge with/as nimh they will burst, set the charger amps, press charge and let the charger tell you when they are finished, race. charge, race again etc.
We balance charge approx once a month, this evens out the cell voltage, and do not fully discharge lipo's, if the car feels as if its dumping or voltage drops below just above 6volts stop and recharge, do not leave in the car connected. For extra safety charge in a fireproof bag, lipo sac.
We find we can manage with one set, but two is nice.