Boardburner2:
Why are you using lipo's ?They are commonly available because they are used extensivley by the RC aero modelling crowd.
Lion are safer to use and common in electric drills ETC, more bulky though.
Lipos need proper balance chargers for safety and longevity.
Lion should be charged the same way but often are not, much more forgiving though when incorrectly charged, they just fail rather than catch fire.
As you say, lipo are used in rc and aero modelling due to its lower weight and its high discharge capacity , some times of hundreds of amperes. I think he is trying to build some RC car or plane, but if he can spend some money on parts for a plane or car, possibily he can spend some more in a dedicated lipo charger.