Roma Battery

Great to hear of the new delivery... I guess the question is how often will you use the car? I have a Cali T and use it about three times a week during the summer for trips over 20/30 mins and this keeps the battery in condition. In the winter its trickle charged as I use the car a lot less

If you are using an external battery pack to condition the car battery it will need to be quite big. If the trickle charger uses 10-20 watts this is 1 to 2 amps per hour, a camping or leisure battery might typically be 100 - 150amp but think you can only use about 50% of the available change, not an expert on this.

I hope this helps

 

The owner manual gives explicit time limits fot car parked without battery maintenace. Additionally, for cars driven only short distances, e.g. 20 miles per week, the onboard charging system may not have enough time to get battery up to snuff. My 2016 Cali T is put on battery maintainer within 24 hours after any drive, no problems with that practice in my experience.

 

20 minutes at a time?. Please don't be the resale Ferrari owner who believes that saving his car to not loose money is your goal. Don't know your situation or if your only vehicle but enjoy it not make it a typical garage queen.
20 minutes IMO does it more harm than any possible good. We drove all ours almost daily. Never cared about pump price, maintenance cost, mileage, or MPG.... we just had/have the greatest experience every time we enjoy our special vehicles as others seeing you will as well. Find time for a couple hours. But, congrats on the car. You're sure to be thrilled.