I've read about zinc-air batteries that should reduce electric storage costs.
https://nantenergy.com/zinc-air/
Can I buy them in New Zealand ?
I see no evidence you can buy them anywhere, let alone NZ
https://www.engineering.com/ElectronicsDesign/ElectronicsDesignArticles/ArticleID/17776/NantEnergys-Zinc-Air-Battery-Crosses-the-100kWh-Barrier.aspx
"NantEnergy intends to have factories in California manufacturing the batteries in 2019."
Currently they are still very bleeding edge, and not in commercial production
