EQS Charging Question
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Member
Joined: Jun 2002
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From: Suburban Philadelphia
2019 G63
EQS Charging Question
Have an AMG EQS on order with production in July and installing the ChargePoint in my garage. There are times during the year where I will not drive the EQS for probably 2-months or more, during the winter when I use my G63. How long can the EQS sit and hold an adequate charge or, can I simply leave the charger plugged in to maintain the batteries at some lower level for an extended period?
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From: WI
17 E43; 21 GLS580
Have an AMG EQS on order with production in July and installing the ChargePoint in my garage. There are times during the year where I will not drive the EQS for probably 2-months or more, during the winter when I use my G63. How long can the EQS sit and hold an adequate charge or, can I simply leave the charger plugged in to maintain the batteries at some lower level for an extended period?
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Joined: Jan 2022
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From: Western North Carolina
2022 EQS 450+, 2020 C300 Cab, 2019 Jeep GC
The recommendation from MB was indeed to unplug the car and check every 6 weeks. If battery is 30% or below plug it in and charge back to 50%. But as you might not be in the same location as the car, another member suggested it made more sense to leave it plugged up and manage the review and recharging with the App. The car is "supposed to" maintain the 12V but I would feel much more comfortable with a battery maintainer.
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2024 EQS 450+ SUV
I suggest that you drive it to North Carolina and I will be happy to "car sit" for you during the months you are going to drive it. I will even exercise it daily so it remains happy! Let me know when you are coming 
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The recommendation from MB was indeed to unplug the car and check every 6 weeks. If battery is 30% or below plug it in and charge back to 50%. But as you might not be in the same location as the car, another member suggested it made more sense to leave it plugged up and manage the review and recharging with the App. The car is "supposed to" maintain the 12V but I would feel much more comfortable with a battery maintainer.
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Has that changed? From other posts on the forum I've understood that the 12 V battery is only charged when "the engine is on", not when the car is parked.
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From: WI
17 E43; 21 GLS580
The recomended long term storage is charge to 50. Unplug the vehicle and thats it. No trickle charger.
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I know the manual recommends the actions you describe above. The manual also says:
Why does the vehicle need to be switched on when the 12 V battery is low? I interpret the 12 V battery may die irrespectively of the high voltage battery having enough juice. The solution is to drive the car (which mainly consumes the high voltage battery further but also enables 12 V battery charging). The second option is a bit unclear, isn't any high voltage battery charging sufficient (at home or at a charging station)?
On the other hand, the high voltage battery has no load when the car is parked. The 12 V battery keeps many systems up and running. Odd if the advice is to only follow up the high voltage battery voltage during long term parking unless the car actually charges the 12 V battery when needed (thus the only concern being the high voltage battery running out). I'd like to see the function description from the workshop documents if anyone has that at reach.
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When my car was at the shop for PPF and tinting, I got the notice via the app that the 12V battery was critical. Contacted the dealership and was told that because the hood was opened, no changing was done. Sure enough, after they closed the hood, everything went back to normal.
Initially, I was concerned about the well-known PTCU update, and it turned out this update is VIN specific and I didn't need it.
Initially, I was concerned about the well-known PTCU update, and it turned out this update is VIN specific and I didn't need it.
