Bicycle light Superfire BTL05 — compact front/rear LED light, USB rechargeable

Superfire BTL05 is a compact, lightweight bicycle rear light with a 2.5 W red LED designed to improve visibility after dark. The device offers five selectable light modes and a built-in rechargeable battery, providing practical runtime for urban and countryside cycling. Compact dimensions and an elastic strap mount allow quick tool-free installation on the seatpost or other parts of the bike.

Advantages

The Superfire BTL05 combines strong optical output with several warning patterns, fast charging and durable construction. Its IP65-rated polycarbonate housing resists splashes, dust and mechanical impact, while the flexible mounting strap ensures stable attachment and easy removal. Low weight and small size make it convenient to carry or store when not in use.

Key specifications

• Manufacturer: Superfire
• Model: BTL05
• Light color: Red
• Power: 2.5 W
• Light modes: Strong light / Weak light / Fast flash / Slow flash / Breathing
• Operating time: Strong light ≈ 2.3 h; Low light ≈ 4 h
• Rechargeable battery: 3.7 V, 250 mAh
• Charging: Micro-USB 5 V, 0.5 A
• Charging time: Approx. 1 h
• Protection class: IP65
• Material: PC (polycarbonate)
• Working temperature: -10°C to 40°C
• Dimensions: 35 × 38 × 32 mm
• Weight: 23 g
• Mounting: Elastic strap, tool-free

How to use

Charge the lamp via the included USB-A to micro-USB cable until fully charged (about 1 hour). Attach the light to the seatpost or another secure frame point using the elastic strap. Switch between modes with the single button: choose steady strong or weak light for continuous visibility, or one of the three flashing patterns for increased attention. Recharge the battery when runtime decreases.

Recommendations

For best visibility, mount the BTL05 at rear-facing positions with unobstructed line of sight to following traffic and check the seal and strap before riding in wet conditions. Keep the charging port dry and charge with a USB output matching the specified 5 V, 0.5 A when possible.