This seems to be an acpi problem, since acpitool reports the same wrong value.
~$ acpitool -B
Battery #1 : present
Remaining capacity : unknown, 99.33%, 00:00:00
Design capacity : 5616 mA
Last full capacity : 5816 mA
Present rate : 2289 mA <----------- WRONG
Charging state : Discharging
Battery type : Li-ion
Model number : 42T4647
Serial number : 2487
So maybe this isn't powertop related.
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