ROQ Back Cover for 6000mAh Power Bank Case for Portable Charger External Battery For Samsung Galaxy S8+A  (Black)

To charge the phone with the battery case: Attach the battery case to your phone, and then press the power button. The battery case will begin charging your phone. Press the power button once to check the battery level. The illuminated LED will show the battery level. Assembly: Slide your phone gently into the the battery case, and make sure the phone is well connected to the micro connector of the battery case. To charge the battery case: Connect the charging cable to the battery case’s USB input interface, and then connect the cable to a USB charger. Press the power button once to charge the phone and battery case simultaneously. The battery case is fully charged when all four LED indicator illuminated and stop flashing. Notes: When charging the Battery Case with phone attached, the phone battery will be charged first. After the phone battery is fully charged, charging of the battery case will begin. You will get 3% off discount if you buy 2 pcs or more! Attention Please: When data cable connecting battery clip charging, you cannot put the phone into the clip for charging. Due to different electric current, in this case, only the data cable is supported to charge the clip, and the clip cannot charge the phone. Hope you know that.