All standard model of pocket - wifi (ZTE - HUAWEY) have a battery of 2200 / 2500 ma
You have about 6 hours of continuous use. The duration is linked to the use you do of your Hotspot. Although it is set to go into standby mode after a period of inactivity, we always recommend to turn it off when not in use.
The charging time is approximately 2.5 hours (from wall power outlet).