Keeping GTC4Lusso T charged while away...

Hello all!

I recently acquired an absolutely stunning 2018 GTC4Lusso in Grigio Silverstone with tan interior thanks to another member of this forum (shout out to you Shekhar!).
I can not stop looking at it. Every time I step out of it, I walk around it admiring the shape. I have been arriving to work early which is very atypical for me because I'm so excited to drive the thing each day.
Anyway, that is not my problem. My problem is that I will be going away for 17 days and I will be leaving my baby in its parking spot at my condo. There is no outlet anywhere. I frequent this forum so I have read about the importance of keeping the car's battery topped up and the problems that can arise if you don't - and I want no part of that.
What can I use to keep the battery in good shape during that time so that when i return I won't have a dead battery and/or all those error messages? I was thinking of a power bank I can precharge and leave next to my car plugged into my car through the cable that attaches under the license plate.
When you are answering, pretend you are talking to a 5 year old. I have no understanding of electronics at all.
I also would like a solution that is fairly durable because I will have to use it again in about 6 weeks when I leave for another 2 weeks.
Thank you all iin advance for your help. I admire you all and respect the heck out of you.

 

I would disconnect the battery

 

Doesn't disconnecting the battery create it's own set of issues, though?

 

Hi Ilan

Makes me so happy you are loving the car

https://a.co/d/33ALto9

look at this one above. I think this should do the job keeping the battery charged. And when this runs out you will still have another week or 10 days before the battery goes below optimal level

 

Thank you - will do that!

 

No experience with this, but looks promising.. solar charger
https://a.co/d/2a2DyPW

 

Surprised no one has mentioned anti gravity batteries. I went an bought a spare external battery (same as above) and found you were looking at one week.max before it ran out. I am in Manhattan and had EXACTLY the same situation as you. See this thread GTC4 Lusso Lounge V12 & V8 USA + California (Worldwide Members Welcome) on facebook
on face book and you will see Scott Jordan has an AG Lithium battery, and he is doing an experiment of 6 week with no charger. It also has an emergency start feature should it drain too low, but my calculation is that it wil be fine to start. I have no financial interest in this, and use regular AGM battery but will 99% likely switch to Lithium when this one finally quits. https://antigravitybatteries.com/products/starter-batteries/automotive/ag-h8-rs
I think this is the Lusso model above

 

hi how long usually last if is only doing a maintainer job?

 

I found it disappointingly quick. A week if you were lucky. And my AGM battery drains decently quickly (i have a monitor on it)

 

My antigravity battery will go for 3 weeks before it starts complain. I have had it on a charger for perhaps 2 times in 4 years…

Have nothing else wired into the FF so no extra drains.

 

I googled average kWh for a battery maintainer. Uses 0.2 to 0.3 kWh per day.