Mat is of course correct, its what you get out that is important, and capacity isnt everything, the running voltage is also important. You can buy a DVM for about £25 that hooks up to a PC and logs the DVM readings, If you have a constant current discharger you can log your discharge results and see the voltage (or do it manually in excel!) This is a good way of comparing batteries and seeing how flat the dischrage curve is under load. You will also see poor cells "dropping out" which results in little steps occuring in the discharge curve. Ideally all the cells should drop out together which is what gives you the sudden "dumping" effect where you car goes from Hero to Zero in half a lap...
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