Using the Fenix HP30R V2 headlamp is easy. First, make sure the 2 5000mAh Li - ion batteries are properly installed in the battery case. You can choose to clip the battery case on the headband or wear it on your belt according to your preference. To turn on the headlamp, use the rotary switch to select the spot or floodlight mode you need. When you need a high - powered light, all three LEDs will work together to give you 3000 lumens of light. As a power bank, you can use the dual interfaces to charge your other digital devices. When it comes to maintenance, keep the headlamp clean and dry. Avoid exposing it to extreme temperatures. If the battery runs out, use the charging interfaces to recharge it. Don't forget to check the battery life regularly to ensure it's always ready for use.