That's the difference. This guy holds much more charge and eventually the charge here will run out. But this guy will still have enough charge. So the charge and electrons will continue traveling from here to here. So this guy literally houses more electrons and that's why it's more expensive. So, for example, this battery will be able to run a light bulb for say, 15 minutes, while this guy will run a light bulb for say, 4 hours.