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Our 2008 Chrysler 300c has 2 batteries instead of the usual one. This is common on boats and RVs but not on cars. It has a large battery in the back far away from the starter motor and a smaller battery in the front close to the starter motor. When Barbara left the lights on we went out and jump started the car on the front battery and it started fine. Why don't they separate the batteries for Engine and cabin like in marine applications? Why is the big battery not in the front? What is the purpose of two batteries when it was easy to flatten the system anyway?

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The battery is located in the trunk next to the spare. There is a positive battery terminal in the engine compartment located next to the fuse box. Maybe this is what you are referring to as a smaller second battery? It's just a convenient place to access the positive battery connection from the engine compartment.

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    I was curious and looked this up. Found a few forum posts where other people were confused about two batteries. Apparently the fuse box/power box under the hood looks a lot like a small car battery with terminals for jump starting and everything. You can see it on the left in this image. – JPhi1618 Mar 6 at 21:28
  • The Jaguar XK-150 had a 12v system, with two 6v batteries. Each battery lived in a compartment behind a front wheel, and was accessible through a little door in the rear wall of the wheel well. I don't know, but suspect that other XK models from the 50s were similarly equipped. – David supports Monica Mar 7 at 1:44
  • My old MGB also has two 6v batteries on either side of the car under a panel behind the seats - also a 12v system. Possibly to balance the weight? – Paul Lydon Mar 8 at 12:16

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