Keep your power supply safe and sound with this clever battery case from Efest. Designed to cradle up to six 18650 batteries, it boasts an airtight waterproof seal that laughs in the face of moisture and the elements. The included lanyard means you can clip it to your gear and never worry about losing your precious power stash. Whether you're out adventuring or just keeping things organised at home, this compact protector has your batteries covered.