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Battery Voltage

 
Old 02-19-2019, 10:19 AM
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Battery Voltage

The other day I got to start the car after it's been sitting for 2 weeks and had some of the functions not working due to low battery voltage. Car drove fine no issue after a few minutes and hasn't really given me any problems since. When I'm driving its at 13.-14.1 and the reason why I'm posting this is I decided today just for the heck of it to look at the voltage and when I was turning to key to turn the car ON it dropped to 10.2-10.5.
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Old 02-19-2019, 11:27 AM
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Either a weak battery or there is a amp draw while it sits. I've read here before of people having issues after the car sits for awhile. Most will keep a battery tender connected while it's not being driven. I do this also.
If it were being driven everyday you may not even notice it.
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Old 02-19-2019, 11:42 AM
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Originally Posted by tlambert View Post
Either a weak battery or there is a amp draw while it sits. I've read here before of people having issues after the car sits for awhile. Most will keep a battery tender connected while it's not being driven. I do this also.
If it were being driven everyday you may not even notice it.
Ya I'm not surprised, the camera that I have in the car will turn on if it detects someone near the car as well as I have a Bluetooth device connected as well, disconnected them for now till I start the car. Doesn't probably help me much battery being from 2010. Once I'm done fixing my E550, I'll buy a battery for the E55. Month of Feb hasn't been the best so far when it comes to my cars, lol.
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Old 02-19-2019, 12:25 PM
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WHat is voltage when starter motor turning?
What is voltage with Key out of ignition?
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Old 02-19-2019, 01:09 PM
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Originally Posted by ygmn View Post
WHat is voltage when starter motor turning?
What is voltage with Key out of ignition?
When its turning its 10.1-10.4, key in ignition or out was 11.9.

Last edited by karpetcm; 02-19-2019 at 01:15 PM.
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Old 02-19-2019, 02:19 PM
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What you want is key out battery @ 12vdc.
Then when start spinning hope it never goes below 9VDC.

If it goes lower then 9VDC you will need new battery pretty soon
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Old 02-19-2019, 02:26 PM
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Originally Posted by ygmn View Post
What you want is key out battery @ 12vdc.
Then when start spinning hope it never goes below 9VDC.

If it goes lower then 9VDC you will need new battery pretty soon
ya so far it goes to about 10.1-10.5 during crank. I think just not driving it for a couple of weeks and hooking up the camera to turn on when it detects someone there put a strain on it. It's not a new batter being from 2010. Next month ill just change it out for piece of mind. I would do it now if I didn't have a couple of issues with my E550
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