i don t understad that graph Voltage of the batery vs capacity in mA? xD i think u whant voltage vs time or mA usague or something like that xD
i do a batery monitor, u have to make a sketch measure you batery max charge voltage and the min safe voltage, the use analog read to measure it and use the map function to display it ass % or if u can take alot of reads of your analog read and paste it in exel they make for you a nice graph showing the discharge rate over time