/diy/ - Do It Yourself

>>955752
http://www.digitaltrends.com/cool-tech/hydrostor-underwater-balloons/
http://wattsupwiththat.com/2015/12/12/underwater-balloons-a-new-idea-in-energy-storage/
http://www.hydrostor.ca/
http://www.sciencealert.com/underwater-balloons-could-give-us-a-new-way-of-storing-renewable-energy

https://youtu.be/c7j2lwz4_Vs

I recently saw a cool method of storing energy by filling balloons underwater with air. When energy was needed the balloons could allow air out and spin some turbine, I suppose.

I'm wondering about storing energy in an end of the world scenario. Batteries would only last so long. I was thinking you could lift weights, and then let them sink.

So, ways to store energy? Trying to think of things that could be built relatively easily and could last for a few generations.