You need to lift a ton by a meter to store the same energy as an AA battery. This scales badly unless your ton is made of water and so can be easily pumped up a hill.
>This scales badly unless your ton is made of water and so can be easily pumped up a hill.
Or your Ton can sink into a body of Water/Mine/Mountain, pumping Water up a hill is a bit less effective (friction in pipes) if you have Water (however still more effective then loading a AA battery). And Pumping water uphill is a Gravity Battery too (PSH).
>>EnergyVault is designing a LWS system using a tower built from 32-ton concrete blocks, stacked with 120-meter cranes. One commercial unit is expected to store 20 MWh of energy, or enough to power 2,000 Swiss homes a day.
