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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@ClearMemory041063
Accuracy?
You are correct. This kit would most likely measure the on current pulse after it is stretched over the time constant of the RC filter. Likely the low power current would be down in the noise.
For estimating total Amp-hours, add the low power current times time to the measured on current.
Setting the gain on the op-amp figures into the setup and calibration.
My experience tells me that trying it in a freezer is prudent. The cold can affect the battery.
The measurement method is based on linear assumptions. Batteries have some non-linear characteristics, especially with regards to temperature.