Pro controller doesn't charge, as if there's no battery in it
I have two Pro controllers, one of them won’t charge. It can run off of a charged battery fine, but it won’t charge the battery. When I plug it in, the charge light turns on then immediately off, which is exactly what happens if you plug it in without a battery.
So it seems the connections are fine because it can run off the battery, but it also can’t tell that there’s a battery somehow. Any ideas?