How do I charge the battery, and how long does it take to fully charge?

For Maxis Electric and Maxis Airflow, remove the battery from the chair and charge it via its USB-C port using a 5 V/2 A power source. A charging cable is not included. From a low battery level, a full charge takes about 3.5 hours for Maxis Electric and about 4 hours 38 minutes for Maxis Airflow. These instructions do not apply to Maxis Manual.