Q: The battery drops to yellow part then back up.

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The battery will drops to the very beginning of the yellow part when at a stop. If I release the brake so the car walks a little the battery will go back to half. The only times it seems to do it, is when I speed as if I am racing. I have checked the battery it is at 88% life.

My car has 187000 miles.
My car has an automatic transmission.

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