I am doing a battery life indicator for a device. A red led will light up when the voltage reaches below a certain limit, which is at least 2 days before the AA battery fully dies.
As such, I want to know how to determine the number of days left before a AA battery dies. I have attached the datasheet for a AA battery but it only shows the constant current performance chart. My device draws around 50ma current for about 10seconds, 4 times a day, when a motor rotates. And all along, it draws a current (ard 1ma I think) when it runs a timer.
So, how can I determine the voltage when the battery is abt 48hours before "dying"?
you need battery monitor IC which support Battery Fuel Gauge/Gas Gauge.
one sample from ST;-STC3105
make sure select IC type match with battery type.