It's unclear, but if this is Toyota's proven NiMH technology from the Prius, rather than Lithium technology (i.e. in the Tesla Powerwall), I'd personally opt for this.
It will last longer, and is a lot safer. Unlike Lithium, NiMH is not particularly unstable at high temperatures or flammable. And Prius batteries have been proven to last more than 20 years (at reduced capacity) without any safety problems -- we don't ever see Prius' catching fire.
It will last longer, and is a lot safer. Unlike Lithium, NiMH is not particularly unstable at high temperatures or flammable. And Prius batteries have been proven to last more than 20 years (at reduced capacity) without any safety problems -- we don't ever see Prius' catching fire.