Evening light from the 4 carbonfiber-alufoil cells
http://www.overunity.com/13282/carbonfiber-alufoil-selfmade-diy-battery-with-naco3-or-ashwater-electrolyte Hi All, this is the 4 cells in series after around 7 to 8 hours contineous runtime. The voltage on the LED is still 2.52 Volts and you could still read a book…