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I have a 2019 GLE400. This is the last model of the W166 chassis, I believe.
Does this car still have the auxiliary battery? Frankly, when I pull open the cargo bay rear right side panel cover, the cavity is mostly empty! Is it possible MB discontinued equipping the vehicles with the auxiliary battery?
Would like to know if there is any indication that the battery even exists somewhere buried deeper down there before I start pulling off all the trim in the cargo area. Not sure also what indications I would get if it does exists and starts going bad.
I have a 2019 GLE400. This is the last model of the W166 chassis, I believe.
Does this car still have the auxiliary battery? Frankly, when I pull open the cargo bay rear right side panel cover, the cavity is mostly empty! Is it possible MB discontinued equipping the vehicles with the auxiliary battery?
Would like to know if there is any indication that the battery even exists somewhere buried deeper down there before I start pulling off all the trim in the cargo area. Not sure also what indications I would get if it does exists and starts going bad.
In W166 GLEs the aux battery is under rear left second row seat (to access, left doubleseat and seat back must be removed).
In W166 MLs the aux batteries (two kinds were used - "small" and "large" depending on the model/equipment) is under rear right cargo area.
I have a 2019 GLE400. This is the last model of the W166 chassis, I believe.
Does this car still have the auxiliary battery? Frankly, when I pull open the cargo bay rear right side panel cover, the cavity is mostly empty! Is it possible MB discontinued equipping the vehicles with the auxiliary battery?
Would like to know if there is any indication that the battery even exists somewhere buried deeper down there before I start pulling off all the trim in the cargo area. Not sure also what indications I would get if it does exists and starts going bad.
As @threeMBs stated. Look through the DIY in my signature, it’s in there.
BTW - From what I can tell this "auxiliary battery" is just a 12V 1.2Ah SLA (AGM) with F2 tabs. These are often used in UPS's and some older emergency lights and exit signs. They are fairly inexpensive and can be gotten for around $20 or less.
I'm wondering if there is room under that seat to install a bigger battery? Like a 12V 9Ah SLA instead. The only real issue is space and mounting, from a power perspective I doubt the car would know the difference (other than the fact that it would provide a longer runtime)
This is an extremely important battery and more important than most people think (no offence to anyone).
It is powered from the main battery. If, for example, your main battery died and drained this aux and it became sulphated
merely changing the main battery does not guarantee a start. This little POS is responsible for telling the main ECU that the tranny is in 'Park' to allow a start.
So, if this battery dies, you cannot get a tow because you wouldn't be able to get the car in neutral without it. See?
So, after I installed my new aux, I also extended both wires to the trunk area to allow a future 12v supply to the tranny ECU (which you could harness from the main battery with just 2 long wires and 4 alligator clips
Has anyone tried installing an 8ah lithuim battery in replace of the old lead acid?
I cant see any reason why it would give trouble? Unless its charge curve will mess with the electronics?
It should be lighter, won't leak or release gasses. It should last many years there?
I haven't but personally I would be concerned about the change. I won't even pretend to be an expert but based on what I've read, the charging methods for lead-acid and lithium are not entirely compatible. Based on that, I'd think that there's some chance that the substitution would cause a fire or other damage because the vehicle doesn't charge it properly.
I will say that my factory aux battery lasted for 8 years (so did the primary battery), and I only replaced them because they were old, not because the vehicle was doing strange things. That's pretty good service in my book.
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