Battery level 60%
09-19-2014, 01:41 PM
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2013 E350 Wagon, prev 2005 ML 500 SE
Battery level 60%
Anybody else have an issue with your battery not holding a charge beyond 60% ? 2013 E350 with 14K.
Even after driving 60 miles on the freeway, I wait for battery to stabilize an hour and it's at 60%.
Dealer checked out battery and charging system---everything is FINE.
No it's not.
Anyone else have this issue?
Thanks
Even after driving 60 miles on the freeway, I wait for battery to stabilize an hour and it's at 60%.
Dealer checked out battery and charging system---everything is FINE.
No it's not.
Anyone else have this issue?
Thanks
09-19-2014, 02:05 PM
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2014 E63S; AMS 100 octane ecu tune; edok tcu tune; BB intakes; dyno tuned
Where can you find that 60% number?
09-19-2014, 02:52 PM
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2013 E350 Wagon, prev 2005 ML 500 SE
battery gauge
I have a battery tester gauge that measures the % of charge at rest for any 12 volt automotive or marine battery.
It is used a lot for testing marine batteries, especially trolling motor batteries to accurately measure the battery charge level.
I think it is a voltage tester with a different scale. For example--not accurate figure but..... voltage of 12.6 = 60% charge, etc.
It is quite accurate. I even checked out my loaner E350 battery to make sure the gauge wasn't going bad--- 95%. My wife's Accord --98%.
My E350---- 65%
It is used a lot for testing marine batteries, especially trolling motor batteries to accurately measure the battery charge level.
I think it is a voltage tester with a different scale. For example--not accurate figure but..... voltage of 12.6 = 60% charge, etc.
It is quite accurate. I even checked out my loaner E350 battery to make sure the gauge wasn't going bad--- 95%. My wife's Accord --98%.
My E350---- 65%
09-19-2014, 05:57 PM
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2014 E63S; AMS 100 octane ecu tune; edok tcu tune; BB intakes; dyno tuned
I would hook up a ctek trickle charger for a couple nights and see if holds and maintains a higher charge %
If not, something wrong with your battery or charging system
If not, something wrong with your battery or charging system
09-19-2014, 06:35 PM
#5
I am having the same issue, 2012 SLK250 20K
12.3 volts
New AGM battery which was great for awhile
Did charge up properly on 500 mile trip
Short trips around town and a week later back to this low voltage BS.
Currently charging with Ctek 7002 charger, (that thing gets HOT...)
12.3 volts
New AGM battery which was great for awhile
Did charge up properly on 500 mile trip
Short trips around town and a week later back to this low voltage BS.
Currently charging with Ctek 7002 charger, (that thing gets HOT...)
Last edited by jerryt; 09-19-2014 at 09:06 PM.
09-19-2014, 10:33 PM
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2013 E350 Wagon, prev 2005 ML 500 SE
charger
I did charge it up to 100% and then let it sit for 5 days.
Slowly-----down to 60%.
The dealer says we have a $4000 tester and it's all fine.
I'm sending in their service follow up card so expect to hear back from them
09-20-2014, 09:21 AM
#7
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2014 E550-sold 😩
Perhaps you have something draining the battery. In my old E500 I had a very small leak in my airmatic system that would cause the pump to cycle every 2-3 hours. My battery always seemed to be down on charge, but not enough to not start the car. I didn't know that I had the leak until I went on vacation and my car was flat on the ground with a dead battery.
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09-20-2014, 10:56 AM
#8
I am having the same issue, 2012 SLK250 20K
12.3 volts
New AGM battery which was great for awhile
Did charge up properly on 500 mile trip
Short trips around town and a week later back to this low voltage BS.
Currently charging with Ctek 7002 charger, (that thing gets HOT...)
12.3 volts
New AGM battery which was great for awhile
Did charge up properly on 500 mile trip
Short trips around town and a week later back to this low voltage BS.
Currently charging with Ctek 7002 charger, (that thing gets HOT...)
After charging the battery all night with Ctek 7002, battery had Open Cell Voltage of 13.3
Car running at idle 14.1 volts
Found this thread;
https://mbworld.org/forums/c-class-w...ml#post4731335
So maybe this low charging rate is by design ????
Current MB's use the alternator differently to older models.
Most have variable output alternators to help reduce fuel consumption.
In most cases once a battery is fully charged they hold battery voltage between 12.6v-13v to reduce fuel consumption.If you apply the brakes then the voltage may increase to as much as 15v to recoup the "free" energy, if accelerating then it may drop as low as 12v. The engine ECU determines what voltage it wants to maintain at the battery based on load/temps/electrical consumers etc.
All Bluefficiency models have this, and most other current models.
They are fitted with bigger batteries to compensate for this so you will get a lower cranking voltage becasue the battery isn't aways fully charged when you park the car.
Most have variable output alternators to help reduce fuel consumption.
In most cases once a battery is fully charged they hold battery voltage between 12.6v-13v to reduce fuel consumption.If you apply the brakes then the voltage may increase to as much as 15v to recoup the "free" energy, if accelerating then it may drop as low as 12v. The engine ECU determines what voltage it wants to maintain at the battery based on load/temps/electrical consumers etc.
All Bluefficiency models have this, and most other current models.
They are fitted with bigger batteries to compensate for this so you will get a lower cranking voltage becasue the battery isn't aways fully charged when you park the car.
Another quote from; http://www.exploroz.com/Forum/Topic/..._vehicles.aspx
Originally Posted by Allan B
replied:
The new "Intelligent" alternator control is intended to reduce fuel consumption and emissions in several ways.
1) The alternator output (and hence engine load) will be reduced or even ceased during acceleration to provide more power (at any given throttle) to the vehicle's wheels.
2) The alternator output will be reduced to zero during idling to reduce engine load and emissions.
3) The alternator output will raised during engine braking during deceleration to provide regenerative charging.
Projected fuel savings are 3%.
AGM cranking batteries are being introduced to allow for a more cyclic charge pattern and will frequently be operating at about 80% SOC.
Articles on this subject are hard to find on the internet without access to authoritative professional sites and some uninformed information exists.
I cannot reliably determine how this new alternator control will affect the charging of auxiliary batteries but it seems likely that at least DC-DC charging will be required and even that will need some special attention by the manufacturers. It is also possible that third parties may offer vehicle modification solutions.
The new "Intelligent" alternator control is intended to reduce fuel consumption and emissions in several ways.
1) The alternator output (and hence engine load) will be reduced or even ceased during acceleration to provide more power (at any given throttle) to the vehicle's wheels.
2) The alternator output will be reduced to zero during idling to reduce engine load and emissions.
3) The alternator output will raised during engine braking during deceleration to provide regenerative charging.
Projected fuel savings are 3%.
AGM cranking batteries are being introduced to allow for a more cyclic charge pattern and will frequently be operating at about 80% SOC.
Articles on this subject are hard to find on the internet without access to authoritative professional sites and some uninformed information exists.
I cannot reliably determine how this new alternator control will affect the charging of auxiliary batteries but it seems likely that at least DC-DC charging will be required and even that will need some special attention by the manufacturers. It is also possible that third parties may offer vehicle modification solutions.
"LIN" alternator linked to the engine control module per LIN
LIN = Local Interconnect Network, communication is two-way between engine control module and alternator.
Two short trips in town and measure battery directly 12.5
Measured wife's 2010 Jetta TDI and it is also 12.5, but it does not have a AGM battery...
Getting closer to a solution;
http://*******.com/Thread-Advice-on-...2205#pid322205
Originally Posted by Rocinante' pid='322205' dateline='1412129073
Well, being a 2012, I would say for sure you need the Rear SAM software update... it modifies the charging behavior.. originally, Mercedes wanted the battery to remain with a slightly low charge state so they could take advantage of deceleration charging to get better gas mileage, but for most people who don't drive much or drive in stop and go traffic, it really doesn't work out for them and it kills the battery... I have personally seen the battery voltage get below 12.4v when driving down the road with the Star Diagnosis machine hooked up, and after the update, the voltage never gets below 13.4 volts..
Last edited by jerryt; 10-01-2014 at 10:31 PM.
