8.4v output will not charge an 8.4v battery. You need atleast 1 volt over cell voltage to charge. Your charger may be telling you the battery it's rated for, not it's actual output.
Only way you're going to know that is to use a mutlimeter and see what the charge voltage actually is.
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Age verifier Northern Alberta
Democracy is two wolves and a sheep discussing what's for dinner.
Freedom is the wolves limping away while the sheep reloads.
Never confuse freedom with democracy.
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