Q: BATTERY AND BRAKE LIGHT ON AND WONT GO OVER 20 MPH

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I noticed yesterday that the battery and brake lights were on when I cranked my car. The car ran fine. I went out last night to run an errand, the lights were off and it still ran fine. This morning the lights were on again and stayed on. Then i began to lose power as I went to take off from a red light. it wouldn't go more than 15 or 20 mph. i pulled into a parking lot and turned the car off. I went to crank it and it wouldn't crank. I tried again and it cranked but still had little power. A few minutes later the dash lights went off and I had full power. What could this be?
My car has an automatic transmission.

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