dischage rates for dummys

[Serum]

Why is that Brian?

the only downside is the weight, otherwise it should be okay if you used proper balanced cells.?

If it's good for 48amps you can get 900watts.

Not sure how much the motor would pull, to get twice the current capacity you would need two of these packs in parallel (as already mentioned).
Another option is getting packs which can deliver more current / amps safely. This would be lighter too.