You are reading a single comment by @Not/random-user and its replies.
Click here to read the full conversation.
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Not/random-user
You can assume a rechargeable is 3.7 V unless otherwise stated, so your light is likely 3.7 x 10.8 = 40 Wh. That would correlate with it containing three 18650 cells, which other big Exposures do.
So your light consumes 20W of power, or 20/460 = 4.3% of her eBike battery per hour of runtime.