I'd be more worried about blowing stators and regulator rectifiers. Motorcycle electronic systems and batteries are bad enough on sportbikes to run the stock systems. I mean it seems like across every major brand, stators and R/Rs blowing up. They're just not designed like car electronics to handle multiple electronic components. You're going to be making more demands out of this system to convert more current (and therefore make more heat) and then the stator to charge the bike more.
I dunno if anybody had done any studies or research, but I notice a large proportion of my friends that install HIDs go on to have electrical problems. Could be coincidence. Could be some of their dumbasses just fucking up the install, who knows.