GRE RBR60 Manuel D'instructions page 8

PROBLEM
If the charger shows red light all the
time, it cannot change to green light
more than 8h.
If the charger change to green light in a
very short time, and the device also
only work for a short time (within half
an hour, need multiple validation).
When the product starts to charge
after the work is over,if the charger
shows green light all the time.
( Make sure the charger cable is
properly and completely connected to
the external adapter and robot. )
If the charger light does not
light any more.
POSSIBLE CAUSES
Battery damage.
Charger is damaged.
SOLUTION
Please contact the dealer to replace
the battery. Warning! Don't turn on the
robot and replace the battery yourself.
This can cause serious or fatal injury,
so the warranty will
not be valid.
Contact the dealer for replacement.
Warning! Using the wrong external
adapter will result in damage to the
robot / battery and void the warranty.