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Fenix BT20 Bike Light is a powerful, compact and light weight 4 x CR123 / 2 x 18650 battery powered cycle light suitable for off road, cross country and commuter cycling.

BT20 features a Cree XM-L- T6 Neutral White LED delivering 750 lumens at Max output and excellent colour rendition/penetration of rain and fog. A wide beam aspherical reflector with revolutionary dual distance beam technology lights a wide area both close in and at a distance with safe, non glare illumination.

Fenix BT20 Cycle light offers 4 lighting levels of 750 lumens (1 hr 50 min), 450 lumens (3 hrs 45 min), 300 lumens (6 hrs 20 min) and 100 lumens (19 hrs 30 min) plus 300 lumen flashing mode (14 hrs). Output and run times quoted using Fenix ARB-L2 2600 mah Li-ion rechargeable 18650 batteries (not included)

Fenix BT20 provides full left-right adjustment for spot on beam placement, LED power indicator built into the switch (changes from green to red to indicate low battery), and is suitable for handlebars of 20-35mm diameter with its simple quick release o-ring mounting system. Supplied with a helmet mount for added versatility.

Weatherproof construction to IPX-6 protects the Fenix BT20 in harsh conditions.

Rechargeable batteries and charger not supplied, please see related products.

Supplied with 4 x CR123 non rechargeable batteries (retail sale only)


Model Fenix BT20
Battery Type 4 x CR123 / 2 x 18650
Power Levels 3 plus flashing mode
Operation Push button on / off / mode switch with power indicator
Output Max: 750 lumens - 1 hr 50 min / Min: 100 lumens - 19 hrs 30 min


  • Utilizes a Cree XM-L (T6) LED

  • Powered by four non rechargeable CR123 or two rechargeable 18650 batteries

  • Uses aspherical reflector, with a wide beam angle

  • Anti-glare lens design produces safe dual-distance beam illumination

  • 4 types of output: 100 lumens (19 hrs 30 min), 300 lumens (6 hrs 20 min), 450 lumens (3 hrs 45 min), 750 lumens (1 hr 50 min), flashing mode - 300 lumens (14 hrs), tested using Fenix 2600 mah ARB-L2 18650 lithium batteries

  • Mode memory remembers last used output level (except flashing mode)

  • Digitally regulated output - maintains constant brightness

  • Overheat protection function reduces output to protect the LED

  • Low power indicator on the lamp unit

  • Quick to attach and detach using O-ring mounting straps sized for 20mm-35mm handlebars

  • Full left-right adjustment of lamp head for perfect beam alignment

  • Made from aluminium alloy and quality plastic
  • Retail packaged Fenix BT20 inc:

  • Lamp unit

  • BA4C, 4 x CR123 / 2 x 18650 battery case

  • O-ring mounting straps x 3

  • Extension cable

  • Battery case protective sleeve/mount

  • Helmet mount

  • Instruction manual

  • Warranty
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