All the Dinotte lights are very high-powered lights with the corresponding high power consumption. I don't know if you'll get significant battery light if you want a smallish light with an internal battery. Current battery technology cannot yet pack that many Ah to meet that expectation.

Nevertheless, I'm yet another satisfied 140L user. I've been stopped numerous times by both cyclists and motorists to ask about the 140L simply because it is so visible. It's expensive, but worth it if you can spare the money.

The external 4-AA battery pack is fairly small and can be stashed many ways. I have a 140L on my commuter Brompton and I basically assembled the helmet mount upside down with the 4-AA battery pack on top of the light but "underneath" and "in" the saddle. The whole assembly is not intrusive at all. The 2-cell Li-ion battery is also quite small but of a different, flatter-but-longer/wider shape.

727336257_CJrab-L.jpg