Rechargeable Waterproof 18650 Battery Case for Cycling Bike Lights and Headlamps Power your cycling adventures with this versatile battery case designed specifically for outdoor use. Compatible with multiple devices and built for durability, it ensures you stay prepared on the road or trail. Key Features and Benefits: Designed for Cycling Bike Lights and Headlamps Compatible with DC interface (8.4V bike lights) and USB interface (4.2V headlamps). The USB port can also be used to charge mobile phones in emergencies. Easy to Use Simply load 4 to 6 pieces of 18650 rechargeable 3.7V batteries into the case, screw on the cover, and produce a readytouse 8.4V battery pack or portable power bank. Durable and Waterproof Construction Made from quality plastic that is lightweight yet protective against water exposure, making it suitable for allweather riding. Compact Size Case dimensions: 9 x 6.7 x 4.8 cm, easy to carry and fits conveniently in a backpack or bike bag. Power Status Indicators Features a blue switch with 3 LED indicators to monitor battery capacity: Three lights on: Power ≥ 80% Two lights on: 50% ≤ Power ≤ 80% One light on: Runtime ≤ 30 minutes ( or recharge batteries) Practical Applications: 1. Outdoor Cycling Reliable power source for bike headlights during night rides or lowlight conditions. 2. Emergency Charging Acts as a backup power bank to recharge your mobile phone when away from electrical outlets. 3. Camping or Hiking Provides portable energy to power compatible headlamps and devices, even in wet environments. This Rechargeable Waterproof 18650 Battery Case combines functionality, durability, and ease of use, offering dependable performance wherever your ride takes you.