Tech has moved along since these articles were written, with many off the shelf LiFePO4 options available. (Though if you do go lead acid, use an AGM; it will s

Tech has moved along since these articles were written, with many off the shelf LiFePO4 options available. (Though if you do go lead acid, use an AGM; it will save you from many HCL acid spills.) E.g.: https://ww2.cpapaustralia.com.au/blog/cpap-batteries https://ww2.cpapaustralia.com.au/blog/cpap-batteries If you want more endurance or just want to DIY: Big LiFePO4s: https://www.bioennopower.com/collections/lifepo4-batteries-for-energy-storage-backup/products/12v-15ah-lfp-battery-abs-blf-1215as https://www.bioennopower.com/collections/lifepo4-batteries-f... Portable: https://youtu.be/SJGKuriGRok https://youtu.be/SJGKuriGRok https://www.youtube.com/watch?v=erS3b22FgmU https://www.youtube.com/watch?v=erS3b22FgmU http://www.siliconchip.com.au/Issue/2016/March/Battery-Pack+Cell+Balancer+For+Optimum+Charging?res=nonflash http://www.siliconchip.com.au/Issue/2016/March/Battery-Pack+... http://www.ebikeschool.com/how-to-build-a-diy-electric-bicycle-lithium-battery-from-18650-cells/ http://www.ebikeschool.com/how-to-build-a-diy-electric-bicyc...