I will be visiting some shops tomorrow including one that sells all sorts of electronic gear and has a few "universal" Li-Ion chargers listed on their website to see if they have any suitable chargers.
And I have posted on a local Aussie electronics forum asking if they have any leads on a suitable charger.

If I can find a charger that will do the job its better than just trying to feed current in directly and would give me an external charger I can use going forward.