Interesting detective work. B&M lights are a little cheesy inside, I wasn't really that impressed when I took mine apart to fix the ground issue
Originally Posted by
fietsbob
Looked like 2 coin batteries stacked in series, I see Voltage not pF markings.
look on the top just above 5.5v, the top of the 'F' is just hiding at the edge of the metal plate. And it's F, not pF, thus "supercap"