Hisun HS500 Owner's Manual page 57

4-32 Control Functions
4. When the auxiliary DC jack is not being
used, cover it with the cap.
CAUTION:
Do not use accessories requiring more
than the above maximum capacity. This
may overload the circuit and cause the
fuse to blow.
If accessories are used without the
engine running or with the headlights
turned on, the battery will lose its charge
and engine starting may become difficult.
Do not use an automotive cigarette
lighter or other access with a plug that
gets hot because the jack can be
damaged.