S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600

Does the S550 have two batteries?

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Old Oct 26, 2006 | 11:27 AM
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From: St. Perersburg, Florida
2007 S600, 2007 Lexus RX400h, 2006 RR Phantom (wife's car), 2006 Corvette Z51
Does the S550 have two batteries?

My S600 has one small one under the hood for starting and one large one in the trunk for service? I've never heard anyone discuss this...was surprised when I found this configuration on my car.

Last edited by Buffer; Oct 26, 2006 at 11:30 AM.
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Old Oct 26, 2006 | 01:24 PM
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'19 E63S sedan
The large battery is the primary, and does the starting. It is in the trunk for better weight distribution. The secondary battery keeps the management computers from losing power and needing major resetting when the primary goes dead (or is disconnected). It also assures you can use Tele Aid when you have a dead primary battery.

This configuration is used in several models.
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Old Oct 26, 2006 | 02:43 PM
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CLK500 2003, S 600 Model 2007
If you have a recharger set, it's connected to the front battery but in addition it loads the back battery, too. It's highly recommended if not using your car for 2 weeks or more.
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