I'm a software engineer by trade so I'm a bit at a loss. Maybe I don't know the correct words to find what I'm looking for.
I have a Bluetooth Low Energy remote control powered by two AAA batteries. I want to monitor the power usage for the device. I understand how I can put a multimeter between the batteries and the device and measure actual power usage, in milliampere, but I'm more interested in how much power it uses over a span of time. Note that the power usage patterns differ between pairing, standby, when sending a key, etc, which is why I'm much more interested in total power used instead of only the draw at ONE moment in time.
Basically I'm envisioning something like an ampere-counter (electron-counter), instead of an ampere-meter. Which would mean that you read out on the end of the day: 20 mAh used. Does something like this exist?