i am building a little system which has few 2000mAH li-lion cells,
the problem is i want to have a 5 led display to user about the battery status . i have seen video on eevblog , in which dave bargraph driver IC to sense voltage on battery. i have a implemented same thing in past and it works reasonably well. i am little afraid that , if there is no load connected at all , this battery voltage sense method work very effectively. should i put a dummy load resistor with mosfet control to switch dummy load on and off.
i have one more question , it the sensing battery voltage is most reliable and effective way to measure battery capacity. or is there any other method , dave says there are few battery management IC which can calculate charge going in and going out and tell you battery level.
i have a microcontroller in the system, which can sense charge current and load current. i don't mind putting a extra IC just to give a good measurement but , if can be done in software then i will a little more happy.
please forgive me if any thing feels stupid .even after some amount of efforts i could not able to figure out .