Please check with your airline, as each has different regulations as to what they will accept.
Generally your Ecoxgear battery is smaller than what is in your Smartphone.
Here are the specs they will want to know:
The batteries are
- 10,400 mAh Battery Charger
the ECOBOULDER battery is 12V, 7.0Ah Sealed Lead Acid-it is very much like the battery in your car, and should not be allowed to drain completely.