That's totally okay. Use it directly after purchase, and charge the mobile power in time when the power is left about 10%. 1, the mobile power is no first charge, after the purchase can be used directly, the mobile power does not need to be full each charge, how much to use.
2, in the process of using the mobile power, when the power is used to about 10% of the remaining time to charge the mobile power, which helps to improve the service life of the battery.
3, when the mobile power supply is used up, it should be charged in time, after not charging in time, when the power is lost, the battery will be scrapped.