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I have a 2001 Jeep Grand Cherokee. In the boot area it has 12v POWER outlets. 

My question is: If I have a leisure battery in teh boot, connected by lighter socket, does this enhance my car power? i.e. If I am connected via my secondary electrics to my van. Does it give the car output power greater endurance?

OR would it be better to connect this battery in parrellel? Or any other suggestions?

Thanks

Thanks. I certainly take your first point.

The power outlets are more than 5 amp, I think 15/20. I HAVE charged the battery this way for tent camping, with no obvious issues. Usually unplugging the battery from the car when at rest. Never had any poor starting etc. BUT I am mindful of your point.

I think I agree it woudl be safer to simply put it with the other in the van. This is by connecting like to like isn't it? i.e. + to + and - to -.

Thanks again