I have a NiteRider MiNewt. It has an O-ring mounting system so it fits securely on most any handlebars. The battery pack is quite small, charges quickly and I'm pretty sure has a life 6 hours on steady- longer on flash of course. I think it probably is a bit over your price point, but sometimes you can find them on sale and I think they might have a less expensive model, but you can only charge it through a usb port...