Charger Questions - Giant MY20 Service Manual

5.8 CHARGER QUESTIONS

The battery won't charge. What to do?
Always make sure battery and charger are the correct type and compatible
with each other. Visually check both for any obvious issues or damages. Look
for:
Water damage (corrosion, greenish oxides on any contacts)
Wire damage (clamped or torn, inner wires exposed)
Excessive play on connections (charge socket & plug)
Drop damage (cracks & scuffs)
To identify which one of the two causes the problem, cross-check with
another battery and charger of the same type. If it's clear from this that the
charger is defect, replace the charger.
If the problem isn't the charger, measure the battery's output with a multi-
meter. For this the wire attachment for the capacity tester is needed (147LM-
HDBXXX-01, only for non-integrated batteries).
Connect the wire attachment to the output (discharge) connector of the
battery, and connect the multimeter probes to either number 4 & 1, or 3 &
2 terminals on the round connector of the wire attachment (as pictured). A
G-system (36V) battery's voltage should read between roughly 29V (empty
battery) and 42V (full battery).
When a steady voltage is displayed on the multimeter, connect the charger
to the battery. Normally, the voltage should slowly raise from then on as the
battery is being charged. The light on the charger should change from green
to red (charging).
When the Voltage is between 0V and 29V, the battery can be in deep sleep.
With the right equipment, the battery can be charged very slowly with a very
low current (0,5A) to 29V. Once this Voltage is reached, the battery will accept
a normal charge again.
Contact Giant service department if battery Voltage is 0 or much lower than
29V, or when voltage is normal (between 29-42V) but doesn't raise when
charger is connected.
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