Interesting news is that some Japanese article said that only most cheap grade uses Li-ion battery meanwhile other grades use this nickel battery. I wonder is it because really superior than Li-ion or just because it's expensive initially.

Edit: This article said that the new nickel is 1000Wh/L meanwhile Li-ion on cheaper model is 740Wh/L. It seems that now nickel overcomes Li-ion for Wh per volume. (other Li-ions also seems to <= 800Wh/L)

https://car.watch.impress.co.jp/docs/news/1338990.html

https://www.eenewspower.com/news/nanograf-hits-800whl-milest...