On Thu, 25 Jun 2009 14:40:38 +0700, Bruce In Bangkok
wrote:

O.K., if you want to be pedantic,
How much voltage do you need to pump approximately 2000 X ( 6.242 ×
1018^18) electrons per second into a battery.

If the battery is sized properly, 14.2 volts will get the job done,
maybe 14.4 for the first 70 or 80% if you're in a hurry.