Suspect Battery

lasa

Senior Member
Joined
Jan 16, 2018
Messages
82
Reaction score
48
Your Mercedes
E Class estate E212/ 2012/E220
3 days ago my wife's A160 had a flat battery, I put the battery on the Ctek for at least 12 hours on the first night, Ctek showed fully charged in the AM, on the second night I left the battery on the Ctek again for 12 hours or more, again Ctek showed fully charged.

My wife used the car for a longish journey today (with no doubt some stop starts for 'essential' shopping on the way).

Upon her return I checked the battery with a multimeter, 12.47v, is this battery on the way out?

I assume the battery is the original in her 2011 car.
 

Westheath

Senior Member
Joined
Nov 6, 2015
Messages
1,487
Reaction score
486
Location
South London
Your Mercedes
Empty garage, awaiting new toy :)
Yep looks like its under voltage.

Engine running it should be 13.7v to 14.7v

Engine off 12.6v to 13.2v

Probably a sulphated cell @12.4v 75% charge state
 

LostKiwi

Senior Member
Joined
Aug 25, 2006
Messages
26,444
Reaction score
15,896
Location
Midlands / Charente-Maritime
Your Mercedes
'93 500SL-32, '01 W210 Estate E240, 02 R230 SL500 (Malcolm Spec), 04 Smart Roadster Coupe
Yep. As above. Change it at the first opportunity.
Check Tayna or give Grangemouth Mercedes a call and mention the forum. They do great deals for forum members.
 
OP
lasa

lasa

Senior Member
Joined
Jan 16, 2018
Messages
82
Reaction score
48
Your Mercedes
E Class estate E212/ 2012/E220
  • Thread Starter
  • Thread starter
  • #4
Not sure of the protocols observed on here but I don't want to appear to be promoting or criticising parts sellers, happy to share info on PM's.

I bought a 70Ah battery for the wife's A160 diesel.

(OEM battery price = £108.00 on a discount offer).

A well known parts retailer offered a lifetime guarantee for the battery (for as long as I own the car). Edit Note: not an OEM battery.

Could have bought the same battery for £0.77 less with another seller, but only 3 year warranty.

Easy decision for me, 77p difference for lifetime guarantee as opposed to 3 year warranty on the other.

Total cost paid = £56.60.

I bet someone can better this, but right now I am happy :).
 
Last edited:

Submariner1

Senior Member
Joined
Sep 3, 2016
Messages
4,453
Reaction score
632
Location
Windsor Berkshire
Your Mercedes
CL500 2009 5.5
Yep looks like its under voltage.

Engine running it should be 13.7v to 14.7v

Engine off 12.6v to 13.2v

Probably a sulphated cell @12.4v 75% charge state

On that basis, my new replacement battery is knackered. After a few day of non useage it can read 12.4V!
Charge it or drive it and once it settled it would show 12.6V

I reckon its due to their crazy downgrade from a 95AH to 92AH.
With a current drain of 30 mA thats 2.1Ah in 3 days. I.e. if they had left it at 95Ah it would where it is after 3 days.
 

John Laidlaw

Senior Member
Joined
Nov 15, 2013
Messages
26,377
Reaction score
9,035
Location
Wirral
Your Mercedes
BMW 530d X Drive Tourer M Sports
Not sure of the protocols observed on here but I don't want to appear to be promoting or criticising parts sellers, happy to share info on PM's.

I bought a 70Ah battery for the wife's A160 diesel.

(OEM battery price = £108.00 on a discount offer).

A well known parts retailer offered a lifetime guarantee for the battery (for as long as I own the car). Edit Note: not an OEM battery.

Could have bought the same battery for £0.77 less with another seller, but only 3 year warranty.

Easy decision for me, 77p difference for lifetime guarantee as opposed to 3 year warranty on the other.

Total cost paid = £56.60.

I bet someone can better this, but right now I am happy :).
We are quite happy to praise and criticise where it is due on here John no worries ! That is good deal.
I got a great deal once for our old Galaxy from Kwik fit with lifetime guarantee I think £5 more than the best deal elsewhere at tht time- again a no brainer
 

Use the code MERCEDES and get 10% MBO Club Discount, oilman's website:www.opieoils.co.uk

register for news and offers email:sales@opieoils.co.ukphone: 01209 202944
Top Bottom