So Ive been looking into solar/wind energy for off-grid survival. The solar panels are great, they last for like 25 years, but even the best batteries max out at 5 years. Is there any way to make your own battery? I tried tracking down information online but info is few and far between. If I could figure out how to make sodium bisulfate, I could theoretically make sulfuric acid and presto, batteries for life. I dunno, what do you guys think?? Thanks for the help!