You can use the newer LiIon batteries with an older NiMh HID light?
That's great news to me. I got a killer deal on a used NiteRider HID about a year ago ($75! No, it wasn't stolen

), knowing that I can replace the battery, when it comes time, w/ the longer-burning, lighter LiIon battery makes me very happy.
I figured perhaps the lighting circuitry was different and they wouldn't be interchangeable. Any idea if you can swap to a LiIon battery w/ the NiteRider NiMh HIDs?
I've seen all sorts of arguments regarding Halogen v. HID (many in the "total geekiness" thread here.), but having ridden with HID for about a year now, there's just no comparison. For my money a helmet mounted HID is the best night-commute lighting option there is. Too bad the prices are so high.
-Trevor