when you jump the mercedes in front with jumpers how long should you leave it to power up
After the car with the dead battery is started, drive it about 5 miles. If the battery is good and the charging system is working properly the battery should maintain a charge. If the battery goes dead again replace it. Especially if it's 4 or more years old. HTH. -Jim
20 minutes at idle but best to drive it about the same amount of time.
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