Thanks for the Pic - frankly the Blades/Connector looks very decent.
If it wss me - what I would do - With the battery off the bike - and preferably on the garage floor or similar - plugging the charger into the wall 1st - then when charger light goes steady - what happens that 1st moment/secs when you plug charger into the battery ? If it kills the charger - unplug Charger from Battery Immediately then unplug charger from the wall. Does the Charger start charge cycle with normal charging indicator light ? If it does please monitor charger heat and battery heat with your palm to detect any Hot/Hot overheatiing.