|
It doesn't. But it does if you want to charge it in 4 minutes. You have to get all the energy you would normally put into the battery overnight in during the small time. If it takes 8 hours to charge, normally (just a number for arguments sake), you have to supply that same energy at 120 times the rate, to charge in 4 minutes. The only way you can do that at the same voltage is masses of current.
|