Rechargeable zinc-air batteries could be a good thing.

One of the reasons why mass deployment of solar power still remains a distant goal is that most solar panels use lithium-ion batteries, which are expensive, harmful to the environment, and come with the added risk of fires and explosions due to overheating.

For the first time, a safer, cheaper, and more durable alternative to lithium ion batteries has been developed in the form of zinc energy based storage systems.

https://www.cleanenergyauthority.com/solar-energy-news/zinc-air-batteries-solar-power-100118