Aux Battery replacement...
Thread Starter
Member
Joined: Aug 2016
Posts: 245
Likes: 105
2014 E350
Aux Battery replacement...
Hey all,
Anyone replace their aux battery with an inexpensive sealed battery? I found an AGM style for 1/3 the price of the MB, and 1/2 the price of the replacements available at the local Autozone or O'Reilly. Thoughts?
Edward
Anyone replace their aux battery with an inexpensive sealed battery? I found an AGM style for 1/3 the price of the MB, and 1/2 the price of the replacements available at the local Autozone or O'Reilly. Thoughts?
Edward
Thread Starter
Member
Joined: Aug 2016
Posts: 245
Likes: 105
2014 E350
Thanks guys! I figured as much ...it's only an aux battery so I normally wouldn't care since I hate the Eco function anyway. But I just want it working because my wife likes the brake's "hold" function. Gonna go order it now ...thanks, gents! 
Edward
Edward
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The ESS system works off the main battery. Just an FYI
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Joined: May 2018
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From: Jakarta-Indonesia
2014 - W212.065 - E400 ( M276.820, 3 liter Turbo) RWD not Hybrid
Edward,
The appointed AGM battery by MB for both main engine one and the baby aux one at the trunk is matched to the alternator for AGM..where a tiny bit higher charging voltage than non AGM battery.
Since you dont like to use Eco mode ( same as me ), I think its okey to use what you have choosen.
If you like Eco mode, then an AGM one would be ideal for long term reliability due to matching with alternator charging profile.
Now my OEM baby aux battery is 6 years old and so far so good....coz I dont use Eco mode.
Once in a while, do check the sealed ( VRLA ) battery you bought, for sign of over charging and gassing off because usually VRLA likes 14.1 volt as bulk charging and 13.6 volt for float.
The appointed AGM battery by MB for both main engine one and the baby aux one at the trunk is matched to the alternator for AGM..where a tiny bit higher charging voltage than non AGM battery.
Since you dont like to use Eco mode ( same as me ), I think its okey to use what you have choosen.
If you like Eco mode, then an AGM one would be ideal for long term reliability due to matching with alternator charging profile.
Now my OEM baby aux battery is 6 years old and so far so good....coz I dont use Eco mode.
Once in a while, do check the sealed ( VRLA ) battery you bought, for sign of over charging and gassing off because usually VRLA likes 14.1 volt as bulk charging and 13.6 volt for float.
MBWorld Fanatic!
Joined: Jan 2009
Posts: 9,224
Likes: 1,798
From: V E G A S
1922 Ford Model T / no OBD
I bought OE aux battery at FCP Euro due to their lifetime warranty.
I plan to keep the car and since those batteries seem to last less than 3, years, I bet I will get 2nd and maybe 3rd one for free
I plan to keep the car and since those batteries seem to last less than 3, years, I bet I will get 2nd and maybe 3rd one for free
Thread Starter
Member
Joined: Aug 2016
Posts: 245
Likes: 105
2014 E350
Here's the link for Walmart ...same price as amazon: https://www.walmart.com/ip/YTX14-BS-...0001/382940373
Edward
Thread Starter
Member
Joined: Aug 2016
Posts: 245
Likes: 105
2014 E350
Edward,
The appointed AGM battery by MB for both main engine one and the baby aux one at the trunk is matched to the alternator for AGM..where a tiny bit higher charging voltage than non AGM battery.
Since you dont like to use Eco mode ( same as me ), I think its okey to use what you have choosen.
If you like Eco mode, then an AGM one would be ideal for long term reliability due to matching with alternator charging profile.
Now my OEM baby aux battery is 6 years old and so far so good....coz I dont use Eco mode.
Once in a while, do check the sealed ( VRLA ) battery you bought, for sign of over charging and gassing off because usually VRLA likes 14.1 volt as bulk charging and 13.6 volt for float.
The appointed AGM battery by MB for both main engine one and the baby aux one at the trunk is matched to the alternator for AGM..where a tiny bit higher charging voltage than non AGM battery.
Since you dont like to use Eco mode ( same as me ), I think its okey to use what you have choosen.
If you like Eco mode, then an AGM one would be ideal for long term reliability due to matching with alternator charging profile.
Now my OEM baby aux battery is 6 years old and so far so good....coz I dont use Eco mode.
Once in a while, do check the sealed ( VRLA ) battery you bought, for sign of over charging and gassing off because usually VRLA likes 14.1 volt as bulk charging and 13.6 volt for float.
And just as a data point for anyone interested, our E350 is a 2014 model, and we bought it in Aug 2016 with approx 21k miles on it, and the aux batt displayed "malfunction" within days of purchase. So the new factory aux batt (dealer had replaced it under CPO warranty) lasted 4 years exactly, and we never used the ECO function. Batteries are weird like this, IME. Over the many cars and motorcycles I've had in decades (including those of family members since I was the designated family wrench), I have owned and seen some that lasted 6+ years, others a scant two, and I've never seen any correlation with brand name and lifespan whatsoever (will never buy an Optima again, for example!). So at $43 shipped to my door, I think it's a good gamble
Edward
Last edited by Edward993; Sep 11, 2020 at 01:00 AM.
