please advice an EE idiot on using chargers

[vaklaff]

Thank you all for words of experience as well as the pointers to documentation (now I remember reading that bit on Spices, funny how memory works).

Well, I don't have any device to charge the batteries externally. Since I use those calculators just for fun - for occasional programming - maybe I would be better off with buying a lab power supply and just clip the crocodiles, does it make sense? If yes, any suggestion for a particular model or make, or more generally, is there anything I should pay attention to as a buyer? As I already admitted, I'm an EE idiot, I am not proud of it, it's just a sad fact...

Thanks in advance!