Does anyone have any experience with losing battery charge because of an unknown power drain?
Search it on this site. At least 5 posts a week. These are difficult to track down, but usually due to a couresty light switch that is broken and not turning off the lights. Try removing the hood, trunk, and glove box lights to see if they are the culprit. Other known problems are brake lights that glow all the time and electronic modules that break down and leak voltage.