Yes, likely you'd need to get all-new batteries every 10 years[1] or so. (And likely recycle the old ones.) The good news is that batteries are getting about 8

Yes, likely you'd need to get all-new batteries every 10 years[1] or so. (And likely recycle the old ones.) The good news is that batteries are getting about 8% more efficient every year (price per kwh) [2]. So 10 years from now batteries will be 1.08^10 = ~2.15x as efficient [3]. So when you replace them, they'll cost half as much for the same amount of energy storage (and probably half the space too). It's basically Moore's law for batteries except slower. [1] https://www.tesla.com/powerwall https://www.tesla.com/powerwall [2] https://cleantechnica.com/2015/03/26/ev-battery-costs-already-probably-cheaper-than-2020-projections/ https://cleantechnica.com/2015/03/26/ev-battery-costs-alread... [3] or is it 1/(.92^10)? That would be 2.3x