While you wait decades for home battery storage technology to improve, you can make a water battery in the meantime with a few things from the hardware store.
You have to be joking, right? That's a 55 gallons of water as a battery that require 5.5 hours to charge and store 3.9 Wh of energy. Not enough to even power a 10W LED lamp for half an hour. A 10,000 mAh power bank is 37Wh.
