THE SPECS ON THESE WERE GOOD FOR THE PRICE LAST TIME
Rechargeable Ni-MH Batteries
* Choose from 4 x AAA, 4 x AA, 1 x 9V block, 2 x D or 2 x C
* Price per item/pack
AA are 2500mAh
AAA are 900mAh
C are 4000mAh
D none left in the three shops I was in
You should get at least 500 charges out of these, and the cost of charging them is virtually nothing, so comparing to normal batteries you are looking at paying under a penny a charge, counting the electricity and the cost to buy them.
Even the cheapest traditional batteries cost many times more than that - and these will save filling landfills with a shoebox size of dead batteries for each pack you buy.