Recently, I noticed that the standlight, or "Safe-Stop" on my Brompton rear light (Spanninga Eclipse XS) had stopped functioning. The light itself worked, but as soon as the Schmidt stops spinning, the light stopped lighting. I spent a few minutes researching if the light included a capacitor, or if it ran off the front light as does my Supernova E3 system. No detail available. So, I uninstalled and disassembled the light to investigate, and this is what I found:
That's the capacitor. It should be connected to the circuit board. It isn't.
I pulled out the soldering gun and attached it, and the capacitor still had juice left:
Close-up of the soldering fix. Bam.
Reassembled and reinstalled and it's working great. Safe-Stop, engage.