Battery; Battery Voltage; Charging Method; Preservation Method - FlySky FS-i6X User Manual

4.1 Battery voltage

The battery consists of four cells. The single cell voltage of the battery
needs to be kept above 3.5V （14v for one battery）at all times and 4.2V
（16.8v for one battery）is full charge. Excessive charge or discharge will
cause serious damage to the battery. Please use the charger included in
the package for charging

4.2 Charging method

The charger included in the product has the functions of overcharge
protection and balanced charging. You can use the charger directly. The
usage is as follows:
Connect the charger to the power supply and connect the battery
to the charger
When the charger is not charged, the green light will be on; when it
is charged, the red light will be on; when it is full, the red light will be off

4.3 Preservation method

4 Battery