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I have one of the Aldi ones. Also got a built in compressor on it. They are safe to use on you car as its just like connecting another battery rather than say jumping off another car which is what can damage your ECU.
 

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Yeah it can. What happens is the alternator of the slave car sends out a quick spike of around 14-15v when the dead car starts as it tries to charge both batteries, this can find its way to your ECU and fry it. Most jump leads these days come with arrestors to stop this. Doesnt happen with the boost pack as its not connected to an alternator.
 

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I see. What if you disconnected the battery form the slave car, so it was no longer connected to the alternator? It would then become safe to jump start with wouldn't it?
 
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