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I don't think this can be measured in any way. Power drained by the battery will be charged by the adapter at the same time, so either the adapter charges the battery and uses the rest for the system, or it uses the same power for the system and not charge the battery.
– LPChip
Commented Oct 26, 2021 at 11:55
A wattmeter will give a measure of average charge power. Because of the battery, it will not be instantaneous but the wattmeter will likely show battery charge power is the same at 80 and 100% when the machine is at normal idle.
– anon
Commented Oct 26, 2021 at 12:50

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