Hyundai 15EPML Operation Manual page 14

6.3 Precautions for battery charging
a) You must use our special Li-ion charger; charger working voltage is 48V, the
maximum charge voltage is 54.6V, charge current is 6-7A
b) Do not conduct reverse charging
c) If the battery becomes hot obviously during charging, please stop immediately, and
charge again after is cools down
d) When pulling the charger connector, hold the knob rather than pull the wire directly
6.4 Concerning power indicating
Green light on: 70%-100%
Yellow light on: 40%-70%
Red light on: 10%-40%
Red light flashes: null
If red light is on, please prepare to charge the truck;
red light flashing is warning that the truck will stop
working and please charge it. If you continue to use it,
lithium battery will be disconnected, and truck will be
unable to travel.
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Red
Yellow
Green