it is weird how blog entries for off the grid contest disappear. I was documenting how inspired by unagi e scooter batteries, I built a 1s10p unit from ten 18650 batteries from amazon.com and soldered them with nickel plates, used a juicer to charge them, you can charge three stacks easily with s good automated juicer and use a ready 4 volt to 36 volt dc2dc converter cable. That simple.