A vehicle may include at least one controller and a battery configured to be selectively charged with energy from an off-board energy source. The at least one controller may be configured to receive user input specifying a cost minimization mode of battery charging. The at least one controller may be further configured to, in response to the input, determine a time period available for charging the battery, determine when, during the time period, a cost of energy from the off-board energy source is at a minimum or below a threshold cost, and cause the battery to be charged during at least a portion of the time period when the cost is at the minimum or below the threshold cost to minimize the cost of charging the battery.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
 This invention was made with government support under DE-FC26-08NT04384 awarded by the Department of Energy. The government has certain rights in the invention.