I'm still not fully into the smartphone tech;

I just noticed that the list includes a spare battery for the Smartphone. I wonder why?

The nice girl at the mall who set me up with my smartphone last year also gave me a charger that fits into the car cigarette lighter to charge the phone. The car battery will run the phone a long time and recharge the phone battery. I think that would solve the problem. Maybe make sure to have a car charger and cord in the car---I keep mine there.

This could also be shared with other folks phones in the car (if all the phone charging cords were standardized/compatible ---apparently some are not).