[teoman]

From memory... a small gasoline car draws about 6A @ 13V. That is 78W.

Lights are 50W each.

Your cells are 3.6V 2Ah -> 7.2 Wh each. (Probably)


With 1 cell and a boost converter. You can run your car for 7.2Wh/78W = 0.09h = 5 mins(roughly). (Assuming the batt can deliver 24A for 5 minutes, and that the boost converter is %100 efficient)

That is how I do the calculations. Obviously a single cell does not have the amps to run your car.

To run for an hour, you would need 12 cells.
1 hour car consumes 78Wh

78/7.2 = 10.8 cells.

But you want something divisible by 4 in order not to need a boost or buck converter. So 12 cells for 1 hour and no lights or blower or radio.