The original charger was from PSU Design Ltd U.K but that type of charger is obsolete. The one they have now is not the same with the one I want. I could find any other supplier who could supply the same specification of battery charger.
I can find them all day, pages full of them with a simple Google search...
But, then again you need to know the battery type as not all batteries are created the same and different chemistry require different charging schemes...