Lawrence Berkeley National Lab said in a 2011 study that we could build a billion 40 kWh lithium batteries with our existing reserves, however, they assumed only 10kg of lithium per battery (1/6th ...

It also includes DC-couple configurations of either 20 kWh or 40 kWh of energy storage ... Power is stored in the EI Battery, a lithium-iron-phosphate (LFP) battery with 9.9 kWh per enclosure.