outside Battery Red post 12.25V at rest, 14.6V engine running okay?
Thread Starter
Junior Member
Joined: Mar 2007
Posts: 63
Likes: 14
From: T.O Canada
2019 C300 4matic Premium package 2010 C2504matic sports
outside Battery Red post 12.25V at rest, 14.6V engine running okay?
2010 C250 4Matic
only 7000 kms or 4000 miles driven short commutes wkdays only.
Temp recently minus (-) 10 Deg Celcius snowing.(14F)
Car would not start one cold morning.
Called MB Roadside Assistance. contracted Guy came with Battery booster pack hooked up outside the actual battery on the red post and ground and car started.Since then drove it around more distance and car seems to start ok.
At rest after car cools down ,red auxillary post outside battery on driver side shows 12.25 V.
Turned engine on same posts (outside battery) reads 14.6 V
Is this 14.6 V too high and the 12.25V at rest too low,bearing in mind it is belowing freezing temp outside? Should I ask for a new battery with the next service ??? Is there anything diff with this supposedly newer 74 AH AGM battery?
Thanks for any advice.
only 7000 kms or 4000 miles driven short commutes wkdays only.
Temp recently minus (-) 10 Deg Celcius snowing.(14F)
Car would not start one cold morning.
Called MB Roadside Assistance. contracted Guy came with Battery booster pack hooked up outside the actual battery on the red post and ground and car started.Since then drove it around more distance and car seems to start ok.
At rest after car cools down ,red auxillary post outside battery on driver side shows 12.25 V.
Turned engine on same posts (outside battery) reads 14.6 V
Is this 14.6 V too high and the 12.25V at rest too low,bearing in mind it is belowing freezing temp outside? Should I ask for a new battery with the next service ??? Is there anything diff with this supposedly newer 74 AH AGM battery?
Thanks for any advice.
Last edited by petaling; Feb 7, 2013 at 10:37 PM.
MBWorld Fanatic!
Joined: Mar 2008
Posts: 3,714
Likes: 56
From: 1 hours drive north of Sydney Australia
2007 W204 220CDI Classic Sedan
2010 C250 4Matic
only 7000 kms or 4000 miles driven short commutes wkdays only.
Temp recently minus (-) 10 Deg Celcius snowing.(14F)
Car would not start one cold morning.
Called MB Roadside Assistance. contracted Guy came with Battery booster pack hooked up outside the actual battery on the red post and ground and car started.Since then drove it around more distance and car seems to start ok.
At rest after car cools down ,red auxillary post outside battery on driver side shows 12.25 V.
Turned engine on same posts (outside battery) reads 14.6 V
Is this 14.6 V too high and the 12.25V at rest too low,bearing in mind it is belowing freezing temp outside? Should I ask for a new battery with the next service ??? Is there anything diff with this supposedly newer 74 AH AGM battery?
Thanks for any advice.
only 7000 kms or 4000 miles driven short commutes wkdays only.
Temp recently minus (-) 10 Deg Celcius snowing.(14F)
Car would not start one cold morning.
Called MB Roadside Assistance. contracted Guy came with Battery booster pack hooked up outside the actual battery on the red post and ground and car started.Since then drove it around more distance and car seems to start ok.
At rest after car cools down ,red auxillary post outside battery on driver side shows 12.25 V.
Turned engine on same posts (outside battery) reads 14.6 V
Is this 14.6 V too high and the 12.25V at rest too low,bearing in mind it is belowing freezing temp outside? Should I ask for a new battery with the next service ??? Is there anything diff with this supposedly newer 74 AH AGM battery?
Thanks for any advice.
I think that the problem may have been your short trips are not allowing your battery to charge sufficiently . Then it is asked to start a very cold engine partially charged.
I suggest that just in case you have your battery load tested at your local auto electrician or battery shop.
Also if you are to continue with the short trips I think fortnightly top up with a trickle battery charger may be in order ( say over the weekend). C Tek is a recommended brand.
These batterys seem to have a service life of over 8 years so you would be unlucky if it is failing.
The AGM, Absorbent Glass Matt battery is the MB recommended battery & with a life of over 8 years are worth the money.
Good luck.
Carsy
MBWorld Fanatic!
Joined: Sep 2008
Posts: 1,331
Likes: 9
From: Delaware
2004 Mazda6, 1993 RX7
I fully agree with Carsy. If car is close to that temperature for a morning start, an engine heater is advised. Also, this is exactly why they list Castrol's 0W-30 as an approved oil.
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Thread Starter
Junior Member
Joined: Mar 2007
Posts: 63
Likes: 14
From: T.O Canada
2019 C300 4matic Premium package 2010 C2504matic sports
it is very uncommon in Ontario,
eg airport carpark in Manitboba has electrical outlet for plugging in the engine heater but you'll never find these in T.O.
