this is bonaza information free.To make a cell u will need a carbon rod,an aluminum sheet n H2SO4 or HCL. but i advise u to use H2SO4,due to its hydroscopicity(natural dilution).now to prepare H2SO4 u will need a chalk borad(dust)particle,n a hot water.put chalk particles into a filter n pour a hot water into it the filtered water is H2SO4 the remains in the filter is CaO(calcium oxide).palce ur carbon rode n aluminum sheet into the water connect to a meter it will read. now make many of this n connect in series a much higher volt is produce connect in parallel highcurrent is produce.u can charge cell using desktop charger.note that plastic case is good for body case of cell. caution:never use a metal for body case. note:use equal volumes for measurements of both chalk dust n hot water. THIS INFO IS FOR FREE.