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Message: <blockquote data-quote="jarance" data-source="post: 272563" data-attributes="member: 21">I don't think it bad to jump start a car. If is not recommend, then BMW would mentioned it in the user manual.The AAM mechanic do not want to take the risk which is quite normal considering that they don't want to take the responsibilty.Sometime, if you have not use your car for about 6 weeks, there is a possibilty that the battery is drained to a level where you just cannot crank the engine.Even when you have stop your car, there is still some electronic devices like alarm system, radio, clock and other accessories that you have installed which will slowly drained the battery over a period of six weeks. Some people tends to disconnect the battery terminal in order to perserve the battery power when they know that they will leave the car idle for a long time.Coming to your question about the risk of jump start a car. I think there is minimum risk as most of the car nowadays are using alternator which basically will prevent overvoltage. Overvoltage can only happen if you jump start from a car which have a faulty alternator/voltage regualtor or you jump start from a lorry which used 24VDC i.e 2 X 12 VDC.Do not replace your battery with any battery size. The user manual will tell you the correct AH (Amp Hour) rating to use. Using a too low AH battery will not give you enough reserve power to crank the engine and using a too high AH battery will put addition load on your alternator.</blockquote>

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