I saw a video on YouTube a while back where a guy replaced his 12v battery with a LiO pack plus capacitor. I don't know if it was an EV, hybrid, or ICE, but it was significantly lighter. I guess you could always get one of the those solar trickle chargers, too, for that. Between those two... maybe you save your self a mile a year, I dunno. Thoughts?
2015 BMW i3 REx Ionic Silver, Giga World, Tech + Driving Assist, Parking Assist, DC Fast Charging, Harmon/Kardon Premium Sound, Sport 20" Alloy Wheels