The rear light comes with a battery inside so it was ready to go. I will have to go back to Brompton Junction where I got the light to get them to show me how to replace the batteries as I could not see how the back opened. The downside is that I will have to again go through the hassle of unscrewing the light off and then on again.
I have also bought the Lezyne Zecto Drive lights. This are USB rechargeable and were £45 for the pair from Evan Cycles in their sale. You can buy them separately. The beams are powerful and I like that I can wrap them easily around the post and handle bar. The other advantage for me is that I can transfer the same light to my Trek bike. If you are buying the pair open up the package in the shop as I discovered that the pack only had one holder strap and I had to go back to Evans to get another. I still use my Electron Backupz lights as well. This are tiny but bright lights that I usually just leave on the Brompton. I even forget they are there until I turn them on. Still have the ‘cheapo’ lights I bought in Clas Ohlson a few years ago. They are still going strong and I have not had to replace the batteries for over a year.
Why so many lights? I don’t use a reflector vest. I do have a reflector belt that I occasionally use when I remember but vests, belts and gloves are the things I then to leave behind on a train.
You can buy the Brompton LED lights separately but they are advertised as a pair on the website. I struggled to find the link in the first place. As much as I love Brompton their website has always been poor. It is difficult to navigate and the pages are always slow to load.