taramw9

Hi! I’m a travel nurse and leave my ‘21 550 at home in NY which also gets brutally cold and I noticed the battery was low and was never told about putting a charger on it while I’m out of town 🤦🏼‍♀️ Can anyone recommend which charger I should buy? Should I leave it on the charger all the time even if I’m home? Thanks!

Craig B

This is what I’m using, when I’m not using my G 63, I leave it on, it goes into float mode. You can purchase it from Amazon or EBAY, it’s not expensive, but works well.

Hodog16

I use a Noco Genius 5 charger that I bought during the shut down last year. I usually charge my vehicles if they have been sitting for a week.

streborx

If you keep your G parked in your garage that's heated at ~40F you should be OK for a week. If your schedule is unpredictable with longer absences, a battery maintainer as the above posts suggest is cheap insurance. You can find these devices at auto stores for less than $30.

taramw9

Thank you so much everyone for the suggestions! I don’t have a heated garage so it def can get very cold inside. I’m kind of nervous about having to do this but my schedule is all over the place and I could be gone for a couple weeks or several months at a time. Does anyone know is there a feature on the app that would alert me about the battery? I only happened to glance at the app when I noticed the battery was critical if I didn’t look I never would have known!

084runnerltd

C-Tek

They make chargers for several high-end auto brands. The companies slap their logo on it and jack up the price.

They make the “official” chargers for: Audi, Bentley, BMW, Cadillac, Corvette, Ferrari, Ford, Jaguar, Maserati, McLaren, Mercedes, Porsche, and Rolls-Royce.

They sell a “polar” edition meant for extreme cold weather.

CTEK (56-958) MUS 4.3 POLAR 12...

Craig B

To my knowledge, the app doesn’t alert you when the battery is low. My garages aren’t heated, but insulated.

nn7man

Mercedes Me does have a low battery alert, mine was going off regularly even after a long drive. Turned out my battery was faulty and was replaced under warranty. I use the OEM battery maintainer which is made by CTEK.

Craig B

The parts manager at the dealership said there’s no need for the factory maintainer, he told me to go to the auto parts store and buy an inexpensive one. I ordered mine from Amazon. It’s only one amp and charged for a couple days when I took delivery of my G 63. I’ve never seen the warning, I keep mine on the maintainer when I’m not using my G 63.
I have the factory charger from my Porsche, it plugged into the cigarette lighter port.

streborx

Also available are thermal blankets to wrap your battery, such as https://www.oreillyauto.com/detail/c...r/zro0/2800063. Not the easiest to install with the G's battery being underneath the cargo floor, but worth it if you're in single digit temp territory.

Donald Davis

Last
year, my wife’s 2018 E Class had battery replaced under warranty due to lack of use during pandemic. So, I now use Mercedes’ branded trickle chargers on both her car and our G 63. Yes, Mercedes chargers are more expensive, but who are you going to blame if other branded chargers fail? Cheap insurance for a 6 figure vehicle.

Craig B

Craig B

Mercedes doesn’t make the charger, why is it better offering more protection? My dealership gave me a Mercedes jacket, but I like my Patagonia jacket better.

streborx

I'm jealous -- my dealership ask me for their ballpoint pen back after I was done signing the paperwork (lol).

Hodog16

The only time I got a battery alert was right after delivery and it sat at the PPF installer for a week. They put it on a charger and it’s been fine since.

The app did alert me about the low battery like it does if you forget to lock the doors.

Craig B

LoL, they originally gave me a backpack, blanket and flashlight, I said, I would rather have a jacket. They ordered the jacket and I told them, I don’t want a windbreaker. The backpack, flashlight and blanket all had the Mercedes logo on it. They also gave me a Mercedes coffee mug as well.
i gave the blanket, backpack and flashlight back. The jacket is kind of like a Nano Puff Patagonia or Northface Theroball with the Mercedes logo on it.

Craig B

I guess I never let the battery get low enough to receive the low battery warning. It sat at VPC for 5 weeks waiting for EPA certification. The dealership might have charged the battery during the PDI. I have seen the low battery warning on my Porsche.

084runnerltd

The c-tek charger is the Mercedes charger.

Craig B

Yeah I know, I have one for my Porsche.

Highline-Autos.com

CTeck! Never had an issue, and now a days they have so many different styles of charging (full charge, timer, battery limit) they'll do it all.

dcarrer0

I use Ctek for my Aston Martin & would for my G.
CTEK - 40-206 MXS 5.0 Fully Automatic 4.3 amp Battery Charger and Maintainer 12V

streborx

They want me to pay them to do their advertising? At least they didn't paste their decal on my spare tire cover (and I tossed away their genuine polystyrene license plate frame).

Craig B

LoL, I don’t have their name or license plate frame.

jamie140

Mine is about to sit for 5 months while I'm at my winter home.

Assume the negative clip can be attached to the cylindrical metal tube that loops in front of the firewall?

Craig B

yes, it’s off to the passenger side.
As shown in my picture on a previous post on this thread.