tuning

I ordered one of these bikes to ship to Canada. 825 $ to door delivery.

Guys here is the question.

Can I change these old style SLA batteries and install let's say NiMh batteries on this bike with the same AMP and voltage to have more performance and life?

Who could know this?

I found here the batteries

http://www.batteryspace.com/index.asp?PageAction=VIEWPROD&ProdID=988