Was the battery working fine before you tried to charge it?
Did you check to make sure the end of the battery and the charger have no
eliquid on them? Use a tissue and check the little valleys too.
Does the charger work fine with your other battery? And are you sure this battery is discharged enough to need charging?
Try unplugging the charger from power and plug it back in then try putting the battery in again.
If it an auto battery, did any
juice spill on the end of the battery? (that can damage an auto battery some manual batteris but not 510 manual
batteries since those are totally sealed metal on the threaded end)
Also - is this Joye brand or a clone? I would avoid 510 clones.