If you have a couple of hours, watch some of these: https://www.youtube.com/user/RobertMurraySmith/videos https://www.youtube.com/user/RobertMurraySmith/videos

If you have a couple of hours, watch some of these: https://www.youtube.com/user/RobertMurraySmith/videos https://www.youtube.com/user/RobertMurraySmith/videos He's developed carbon only batteries/supercaps that beat Lithium ion batteries by something like double the capacity. Some of what he is working on can be overcharged at high voltage and the cell comes to capacity in a very short amount of time.