KNOG BLINDER ARC 5.5 battery replacement Can anyone please tell me how I would go about changing the battery over in my light please!!! I have so far taken off the lens cover and have undone the 3 x 1.5mm Allen screws to release the outer housing but still can not get to the battery :-(  Thankyou
A quick google search turns up this forum entry by user “RNAV”:
https://www.bikeforums.net/electronics-lighting-gadgets/1085170-knog-arc-5-5-battery-replacement.html


  Remove the trim that surrounds the lens. There are four phillips
  screws holding the lens in place -- Knog fills these in with epoxy so
  you can't use them. I dug out the epoxy with a razor blade. Unscrew
  and remove the lens, and you'll see the LED circuit board. There are
  three black 1.5mm allen bolts; unscrew these. This loosens the heat
  shield from the body of the light that holds the battery. Gently slide
  the heat shield (with the circuit board still attached) forward, and
  it will reveal the 18650 battery compartment (spring loaded on
  negative end). Remove / replace battery, and perform steps in reverse
  to reassemble.


As you can tell, it’s hard to get apart (not intended by the manufacturer) but at least it uses a standard 18650 Li-Ion battery.