Hobbyking Lipo's for 2wd buggy/supastox

[kevden45]

Hey guys just purchased a second hand yokomo B-max v2, I basically have two question in one but both are about lipo battery's. Firstly whats the best size rise to fit from Hobbyking for the b max? and secondly I purchased a schumacher supastox the other day and I'm after 1s lipo's for that now I see Hobbyking do saddle packs that are basically 1s if you use one by itself my question about these is whats the power output then for example I was looking at these: http://www.hobbyking...Warehouse_.html
Now if you used one of the saddle packs what would the mah output be would it be halved to 2500mah? and what about the c rating?

It's pretty confusing this lipo game haha any help is appreciated cheers.