Amount of amps my batteries can handle??

[cal2vin]

I have an '08 x2 with the stock stereo and battery except I added a 10 inch sub with a 250 watt soundstorm amp (cheap). The stock amps and speakers are two jl tower speakers powered by a JL M2150. Then the in boat speakers and stock 10 inch sub are powered by the stock 6 channel JL amp. Im thinking of switching out my tower speakers and the M2150 powering them for some wetsounds. Would I have to add a battery or upgrade the alternator to accomodate the increased power required to run a set of Wetsounds pro 80's or 2 pair of pro 80's?

Thank you,

Calvin