There are lots of different battery chemistries. All are pretty expensive as places to store utility-scale energy. Prices are still falling. Toxicity will not b

There are lots of different battery chemistries. All are pretty expensive as places to store utility-scale energy. Prices are still falling. Toxicity will not be any sort of long-term problem, although in the short term lithium batteries will explode fairly often (e.g. in Teslas) releasing gas that turns into drain opener when it hits your lungs. In the future we will prefer safer forms, such as solid-state electrolytes.