Fenix BC05R V2.0 Rechargeable Bicycle Tail Light

Performance Highlights

• Visibility: 15 lumens across a 180° wide-angle beam, spotted up to 164 ft (50m) away from front, side, or rear.
• Flash Modes: High Flash runs up to 35 hours; Low Flash stretches to 120 hours for long rides.
• Durability: IP66 water-resistant, built for urban commuting and wet-weather riding.

Full mode-by-mode output, runtime, distance, and intensity figures are shown in the specifications chart above.

Key Features

• 5 red LEDs delivering a 180° lighting angle
• Single switch controls power, mode cycling, and battery check
• Battery level indicator (green/red status)
• Mounting strap or body clip — also usable as a backpack/chest light
• USB Type-C charging port under a protective dust cover

Battery & Charging

• Built-in: 400mAh Li-polymer battery (non-removable)
• Charging: USB Type-C — indicator glows red while charging, green when full
• Maintenance: recharge a stored light every 3 months to preserve battery health

Size & Weight

• Dimensions: 2.01" x 0.87" x 0.87" (51 x 22 x 22 mm)
• Weight: 0.99 oz / 28 g (including battery)

Which battery chargers will work with the Fenix BC05R batteries?

The Fenix BC05R has a built-in battery that cannot be removed and can only be charged directly through the light via micro USB. 

Can you purchase extra mounting straps for the BC05 V2?

Yes, please contact our customer service department to purchase additional parts.

How long does it take to charge the Fenix BC05R V2 taillight?

The BC05R V2 bicycle taillight charges via USB Type-C cable and takes about 1.5 hours to charge to full capacity.

What else can the BC05R V2 Tail Light be used for?

With the use of the body clip, this taillight can be buckled in the backpack, and worn in your waist or chest as a warning light. Plus a headband can be added (sold separately) to use it as a headlamp.

See the downloadable PDF reference manual on the product page for complete details.

Overview

• 15 lumens maximum output; 50 meters alerting distance
• 180° lighting angle
• 5 red light LEDs
• Built-in 400mAh Li-polymer battery
• USB Type-C charging port
• Ultra-compact and fashionable appearance
• Battery level indication for checking remaining battery level
• Single switch for easy and fast control
• Matched with the body clip, can be used as a backpack light and chest light
• Size: 2.01'' x 0.87'' x 0.87'' / 51 x 22 x 22 mm. Weight: 0.99 oz / 28 g (including battery)

Operating Instruction

On/Off: press and hold the switch for 0.5 seconds to turn the light on/off.

Output Selection: with the light switched on, single click the switch to cycle through Low → Low Flash (slow) → Low Flash (fast) → High → High Flash (slow) → High Flash (fast).

Charging

Remove the dust cover of the bicycle taillight to reveal the charging port, and plug the USB Type-C end of the charging cable into the light's charging port, then connect the other end to a USB power adapter. The indicator displays red while charging and turns green when fully charged.

Battery Level Indication

With the light switched off, single click the switch to check the battery status; the indicator shows the status for 3 seconds: green on (saturated, 100–85%), green flashing (sufficient, 85–50%), red on (poor, 50–25%), red flashing (critical, 25–0%).

Technical Parameters

• High Flash (Fast) / High Flash (Slow) / High: Output 15 lumens, Intensity 9 candela — Runtime 35 hours / 25 hours / 4.5 hours respectively
• Low Flash (Fast) / Low Flash (Slow) / Low: Output 5 lumens, Intensity 3 candela — Runtime 120 hours / 80 hours / 16 hours respectively

Alerting Distance: 50 meters | Lighting Angle: 180° | Impact Resistance: 1.5 meters | Submersible: IP66

Note: Specs measured by Fenix using one 400mAh Li-polymer battery at 21±3°C / 50–80% humidity; real-world performance varies.

Low-Voltage Warning

When the voltage level drops below 25% of the total level, the battery level indicator blinks red to remind you to recharge in a timely manner. The light will not turn off automatically and will keep working until the battery runs out.

Mounting Instruction

Mounting strap: loop the strap (without LOGO) around the taillight's small opening and place the taillight on the seat post face up, then loop the other end (with LOGO) around the taillight's other small opening and adjust to the seat post's size.

Body clip: with the body clip and taillight both face up, push the small opening on both sides of the taillight downward onto the spout of the body clip.

Note: applicable to bike seat post diameters between 20mm and 35mm.

Usage and Maintenance

• Disassembling the sealed head can cause damage and will void the warranty.
• Recharge the light promptly when the battery level is critical.
• Recharge a stored light every 3 months to maintain optimal battery performance.
• Periodic cleaning helps if the light flickers, shines intermittently, or fails to illuminate due to a poor battery level — recharge or replace the battery.
• If issues persist, contact your authorized distributor.

What's Included

Fenix BC05R V2.0 bicycle taillight, taillight mounting strap, body clip, Type-C charging cable, user manual, and warranty card.