Hey JimmyMack12
Not a lot of the oval guys post over here on the RCTech forums - but there are a few.
4200's are some pretty good packs compared to some of the old stuff from back in the day - but they have been having some durability issues of late.
I abuse mine really bad so they don't last too long - 4-5 months a pack if I'm lucky...
If you want some good info visit the hobbytalk.com boards in the oval racing sections and you'll probably get 100 different answers.
Myself, I charge at 6 amps - discharge after run - charge them back up with about 300 seconds to put them away.. (If I'm being nice to them) Otherwise I run them back to back to back to back all day long - and don't cycle them until a day or two before the next race. (depends on the pack, the race, and the competition I guess) for the 'Birds you will want FRESH STUFF right before the race (but don't wait too long - because EVERYONE wants fresh stuff for the birds so the really good stuff gets scarffed up)