[lincpimp]

Of course, a 5000 20 c pack is "capable" of doing 100amps, and a 10000 10c pack is "capable" of the same thing. Now they may not be correctly rated, but lets just say that they are for the sake or an example.

Generally the lower c rated packs are old technology, and are usually heavier or bulkier than the newer generation stuff. So that 10000 pack may be physically bigger and heavier than the 5000 pack. The 5000 pack may also be capable of charging faster and also have lower IR, so it may last longer. It may also have more "punch" than the 10c pack. It all depends on brand.

You may find that you have an inflated spec 5000 pack, that is why your 10000 pack outperforms it.

So in conclusion mah is very important, a 1000mah 30c 4s lipo will not run a revo, but a 10000 mah 15c 4s lipo will. But if all the packs have the same capacity (mah) the higher c rated pack should outperform the lower ones.