I've been running my All Electronics xenon strobe for about a year now on my 14.4v BatterySpace NiMH bottle battery with no problems. 5 days a week for about 45 minutes one way all winter, and during rainstorms in the summer. Initial output voltage is about 16.6v. The same strobe ran for over a year on a 12V SLA on circuit with a 20W halogen before I moved to the 14.4V and HID from BatterySpace.

I like the Optronic housing you use, if my HID ever bites the dust I'll think about getting one of those instead of the plumbing fitting piece of ugly that I have as backup now.