LG G4c User Manual page 350

Charging the battery
WARNING
Use only LG-approved chargers, batteries and cables. If you use unapproved
chargers, batteries or cables, it may cause battery charging delay. Or this can
cause the battery to explode or damage the device, which are not covered by
the warranty.
NOTE:
Do not open the back cover while your phone is charging.
Getting to know your phone
18