I can recommend a the german brand Busch & Müller (
Busch & Müller: Products). They make lights for dynamo and rechargeable battery power sources, and are top quality. The germans have legal regulations that require a headlight not to blind uncomming traffic among other things, which is great. B&M abides to these regulations.
I have the Ixon Core for a headlight, and Toplight Line as a rear light - both powered by batteries. The Ixon Core has a 15 lux mode for "be seen" and a 50 lux mode for when you need to see an uniluminated road, which it does to perfection. I find that I can commute for an hour a day for about two weeks before the Ixon Core needs recharging, which can be done by either USB or wall plug.
edit: I'm not sure where to buy in the US, but i think Peter White Cycles might be an option.