Yeah thanks... I'll have to get the part number off the black box and see what comes up in a search engine. (Try and work out what it is exactly.) Lots of manufacturers spend all the R&D money everywhere else, then make pathetic chargers. I don't know if Tanaka falls in that category, but if so, the charger could simply be a plain 240V AC to ~9V AC (not DC) plugpack, and the diode could be the cheap & nasty half-wave rectifier to charge the cells.
Of course, that would mean the charger pumps into the cell pack 24/7 until you switch it off manually. Nasty stuff, but it wouldn't surprise me.
