Join Date: Sep 2005
Bikes: Windsor Fens, Giant Seek 0 (2014, Alfine 8 + discs)
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I bet just the protection circuit on the battery died or there's a bad connection. This would make it unable to deliver power or take a charge.
I'd peel that battery pack open and check for bad connections, it's likely the only thing wrong is a loose wire that needs to be resoldered.
All that said, the battery and charger should be fine though you can never tell if the connectors will fit correctly.
I bet the charger is fine too. You could try just replacing the battery first, if you're not in a hurry to get it going again.
Work: the 8 hours that separates bike rides.