1. Always use an Insta360 approved adapter or Fast Charge Hub to Charge ONE X2 batteries.
2. Acceptable battery charging temperatures range from 0℃-40℃ (32℉-104℉).
3. Insert the battery into the Fast Charge Hub's battery slot with the battery's charging point lined up on the same side of the status indicators.
4. A 9V/2A power adapter is suggested. Using an adapter above 9V/2A may not increase the charging speed; When an adapter below 9V/2A is used, the hub will not be able to charge three batteries at the same time, which leads to a longer charging time.