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There's an orange light on the charger that will come on for at least a few seconds when you connect, and switch off when charged. The USB cable is the first thing to check/swap.
(for internal battery. No idea about external)
grams-
The orange light comes on, and then goes away after a while. It could be that by now the internal battery is fully charged. No idea.
Front mech still not shifting, and I don't get this whizzing sound when shifting any more (Front or rear).
The rear mech does respond to inputs from the shifting buttons though.
EagleEyez
How do I know if my Di2 charger is working, and the battery is charged?
Yesterday I rode home on 1 gear (small front ring and small rear sprocket). Now after 2 attempts at charging the battery, it is still not any better.
Where shall I start?
Planning to take it for a service but won't be until next week now as all shops are 200% busy atm.