I noticed there ratings. With less then optimum angles, windscreen between it (huge loss of solar rays) and have less sun in winter, making them almost useless.

I always found electric everything rather annoying. I like the option to open my doors manually, put my parking brake on manually, put mine lights on manually, etc...

Lithium battery boosters are usefull and does not to be charged constantly (unlike the old style jumpstarters that uses AGM batteries), just once every few months. Probably does need to be replaced every few years, as lithium batteries do degrade.

If you drive a lot of short distances, the battery won't be charged properly. In that case, hook it up to a battery charger occasionally. Lots of new cars that are suppose to be very economical on fuel, charge there batteries very slowly or only in certain conditions. Especailly if you have those start-stop systems.