18650 Battery Black/Red

This is the battery UltrAspire designed around—stable, dependable power for long nights on the road or trail. Programmed for low-amperage output, this 3400 mAh 18650 cell delivers consistent performance without spikes, ensuring your Lumen waist light runs brighter, longer, and more reliably. It’s the right tool for the job, whether you’re replacing a worn battery or carrying a spare for extended efforts.

Compatible with all UltrAspire Lumen Waist Lights except the 800 Solstice, and versatile enough for use in many other devices that accept protected 18650 cells.

• Optimized low-amperage output for consistent lighting performance
• Designed specifically for UltrAspire Lumen waist lights
• High-capacity 3400 mAh for extended run times
• Stable discharge curve for reliable brightness
• Rechargeable and long-lasting for repeated use
• Also compatible with many other 18650-powered devices

Key Specs

• Battery Type: 18650 rechargeable lithium-ion
• Capacity: 3400 mAh
• Rated Voltage: 3.7V
• Max Voltage: 4.2–4.3V
• Charging Method: CC/CV
• Charging Time:
  • 4–6 h in lighting unit
  • 2–3 h in external charger
• Cycle Life: ~500 cycles
• Operating Temp:
• • Charging: 0°C to 45°C
  • Discharging: -20°C to +60°C
• Weight: 0.10 lb
• Dimensions: 65.3 mm x Ø18.1–18.55 mm