Such an idiot

I want a spare pair of batteries for my lightsaber as when left in the sabre they slowly discharge. 

It needs special powerful batteries as normal AA don't work. I've now ordered new sets twice of what I thought we AA batteries but what actually turns up are these monsters. FFS! They're not cheap. I've ordered what I now think are AA from the US but they might not turn up till December. Grrr...