Some of you make things way harder than it has to be. USB charging? Why? But, if you must, why also "removable cells". The combination does not exist. Yah, someone will find the $$$ exception. As if ... ... Taillights don't need high capacity batteries. My taillight runs for weeks on two AAA. It's not even worth getting rechargeable AAA's. As said by someone else you can blind oncoming traffic even with the iconic B&M shaped beam headlights if you are careless about the mounting. Since when do we care so much about other people. Do they care about you? I run dual MagicShine 808's (4x18650 x2 packs on toptube) on the bars, aimed before every ride at the hubcaps of any car parked across the street. I have a Cygolite 1200 (on 1/2 power) mounted on my helmet. I also aim that at the hubcaps of a medium distant car before taking off.

Beyond that I don't/can't worry about who my lights might offend. I suggest others take a similar approach. Why? Because, almost without exception, the shaped beam headlights were developed in places where the general lighting infrastructure is excellent. In the USA, not so much! You might also (like I do) have Macular Degeneration, or Cataracts and need much more light at night than a 150L shaped beam headlight can deliver. As long as you put the most of your light power below the eyepoint of the average motorist you should not be causing them undue distress. It's way more likely that the 6000L HID lowbeams on an oncoming lifted pick-up truck causes more visual distress than your nothing special 500+ lumen headlight. FWIW.