New LIPO Question

[neweuser]

My girl has my old 9920. The controller says 99amp. I have been looking at getting her some lipo. But what's the difference between 2s2p vs 2s? They both have 7.4 volts? Also, The lipos' state that they are 60amp or 90 amps constant discharge, and 120amp 10 sec burst? What does this mean? Does the burst mean that a 99amp controller would not be able to handle it? Or do you go by the constant discharge rate? Thanks guys!:007: