Lets say I want a 60 AH capacity, to keep going for a while. I can get these for $2/battery;
10 x GTL 2000mAh CR123A 123A rechargeable battery Blue | eBay
They are 2000MAH (so 2AH?) at 3.6V. So I put them in series in 4 (14.4volts) to run the car (thats what my car uses running with the alternator). So each series of 4 only has 2AH? So for a total of 60 AH I need 20 series = 80 batteries?? That sounds like a lot of batteries... my math has to be wrong lol