IMO, the reason for having a "glamper" is to go "glamping"... That means you have a light in the refrigerator (not a cold hand from digging in the ice chest) and you have a light to read a book at night (not a flashlight held in place by your teeth) and a water pump to flush the toilet after using it (not a trip in the rain to the outhouse)....
The best learning occurs with experience and that big investment has all the features to make life better than the "old popup"... Disabling them to try to get a few extra hours without recharging ??? Defeating the conveniences is almost as "primitave" as keeping the popup would have been. In that case, just keep using the popup and avoid even needing a new battery ?????
You'll be fine with what you have and on that first trip, you'll probably be "delighted" that you can enjoy the comfort of both a refrigerator light and a flush toilet without having to count the difference in 8 watts vs 12 watts of battery consumption....
Use what you paid for and enjoy the "glamping"... It's much nicer "with lights and a refrigerator"