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SL55/63/65/R230 AMG: SL55 Rear Battery Voltage

     
Old Jul 31, 2012 | 11:39 AM
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SL55 AMG
SL55 Rear Battery Voltage
Out of curiosity does anyone know what the average voltage in the rear battery is?

I left for a number of days and hooked up my battery tender to the rear battery. Unfortunately, I didn't check the voltage before I left, but when I unhooked the tender and checked the voltage it measures 12.51 volts. That seem low to me, paticularly since the battery is only 3 months old.......
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Old Jul 31, 2012 | 04:13 PM
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12.5-12.7v when off, 14.2-14.7 with the engine running.
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Old Jul 31, 2012 | 07:32 PM
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ALX,

That is good information to have.

Thanks.......
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Old Jul 31, 2012 | 10:46 PM
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Porsche guy who drives SL63 w/ perf pkg AND perf suspension
after it sits for days, its going to show about 12v , then when you crank it it may go hi for a while till it charges back
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Old Aug 1, 2012 | 11:23 AM
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Thanks for that information too.

I figured the battery should charge up to around 13.5 V and when it was only 12.5 V I was concerned that I had a bad battery on my hands.

So, knowing both the lower and upper voltage eases my concerns.
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Old Aug 1, 2012 | 06:09 PM
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Because our SLs seem to be busy doing stuff that uses battery power even while resting in the garage, most of us use trickle chargers hooked to the trunk battery if the car is not going to be driven for a week or more. Mine sits all winter with trickle on it.
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Old Aug 1, 2012 | 07:04 PM
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Originally Posted by cal1
Because our SLs seem to be busy doing stuff that uses battery power even while resting in the garage, most of us use trickle chargers hooked to the trunk battery if the car is not going to be driven for a week or more. Mine sits all winter with trickle on it.
+1...big CTEK on the SL65 while I'm here on vacation. No issues ever since its been hooked up. Mercedes seems to over engineer everything except battery regulation and cup holders...
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Old Aug 1, 2012 | 10:01 PM
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+1 on the big ctek- I love that charger- have three of them...
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Old Aug 1, 2012 | 10:25 PM
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Originally Posted by alx
+1 on the big ctek- I love that charger- have three of them...
For almost the price of one (1) "Mercedes" brand trickle charger which is just a CTEK with MB logo decal...
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Old Aug 2, 2012 | 09:39 AM
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Originally Posted by AMGfan
For almost the price of one (1) "Mercedes" brand trickle charger which is just a CTEK with MB logo decal...
correct. same box and same markings sans the mb logo.

ditto on porsche and bentley chargers to name a few
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