Since starting to use Brahma as my primary commuting bike, roughly two years ago, I removed all battery powered lights from most of my bikes. I say mostly, because the Raleigh Twenty still has battery powered lights on it.
Recently, I decided to put the Dinotte tail light back on Brahma, since I have been commuting in the evening rush-hour traffic.Don't get me wrong - I am not intimidated by the traffic. But, I want to very visible. I don't mind increasing my visibility one bit.