I think it currently stores energy in a spring, hence helping the user go up and recovering energy on the way down. I was just suggesting that if the energy ca

I think it currently stores energy in a spring, hence helping the user go up and recovering energy on the way down. I was just suggesting that if the energy can be stored in a battery or hydraulic accumulator, it's easier to change the "counterweight" force. In both cases, I think it can be done without any net assistance from the electrical grid.