They'll get lighter as battery tech progresses. The first Li-Ion battery revolution has already happened, it's just not evenly distributed. https://www.androi

They'll get lighter as battery tech progresses. The first Li-Ion battery revolution has already happened, it's just not evenly distributed. https://www.androidpolice.com/what-are-silicon-carbon-batteries-big-deal-for-smartphones/ https://www.androidpolice.com/what-are-silicon-carbon-batter... And that's before we get into stuff like solid state batteries. 10 years from now we'll probably have battery packs which are at least 20% lighter, available in some mid-range vehicles.