SIGMA would have done better to use a much more widespread cell format.

The battery size is pretty bad (LR1 / Lady), I think they could be based on AAA batteries even slightly extend all because if you want to find cheap this format batteries: good courage. I spent several days rehearsing my research to finally fall on German dealers who proposed the batteries of this reasonably priced format (4 to twenty euros). And then to recharge these batteries, you will find a compatible charger (good luck) or buy adapters that slip inside your cells, so still an added expense could have been avoided.

The worst part is that the bike that used this illumination finished bottom of a channel after a fall: good excuse to try another reference not? (Sigma CUBERIDER II, this time AAA size).