A SINGLE-USE BACKUP BATTERY PACK DESIGNED TO ALWAYS BE WITH YOU & ALWAYS READY FOR THAT CRITICAL CHARGE WHEN YOU NEED IT MOST. When a traditional power source is unavailable, and your phone battery fails, the pre-charged Battarix Power Card is a vital resource for uninterrupted communication. This go-anywhere charging card has 3 hours of power and an 8-year shelf-life! Never be caught with a dead phone battery again.