So the pics in #12 weren't the charger but the battery docking connection.
Show us the correct charger pic.
The pic in post #25 is the original charger port for a late model Vengeance. Buyers kept breaking the tiny plug pins, so Suntour concocted the adaptor in post #12 to allow charging through the discharge port.
I'd suggest the OP re-reads his manual
here regarding checking the battery. If still in doubt, I'd take both battery and charger into Halfords, and ask them to try his battery with their charger, and his charger with their battery. That'll give a definitive answer as to what's not working.
The older style batteries and chargers were already a nightmare to fault-find because comms on both input and output of the battery plus the charger's own pre-charge self-test routine made it really difficult to determine anything: These new model batteries and chargers IMHO are even worse.