The Suprabeam B6r comes with either a 36Wh or 72Wh Powerpack. The Li-ion power source is covered by a solid aluminium housing, which protects the battery inside and really underlines the level of high quality materials used for this bike light.
The runtime of your B6r depends on which Powerpack you choose.
Runtime 36 Wh = 1h 15min to 11h 30min
Runtime 72 Wh = 2h 30min to 23h
Compatible with: B6r 36Wh & 72Wh