In reading, it's not clear which types of batteries this is referring - lithium like the Tesla power wall is definitely not the ideal chemistry to use full time

In reading, it's not clear which types of batteries this is referring - lithium like the Tesla power wall is definitely not the ideal chemistry to use full time -- but we have different electrolytic (flow) or catalyst (fuel cell) driven batteries that have similar advantages of the geothermal method without the drilling or maintenance of underground systems. Flow batteries are minimally dangerous, have huge storage capacities, have a minimum maintenance per 1000 charge schedule, and while they are slow to "turn on" are faster than geothermal. Disclaimer; I have a small startengine investment in a Vanadium Flow battery company