Laptop Battery

Most laptop accumulators today contain a small computer that
 - counts how much charge is put into the accumulator
 - counts how much charge has been drawn out of it
 - warns if there are too big discrepancies between these two values (which might mean something is wrong with the accumulator)
 - watches the temperature and interrupts charging when the device gets too hot
 - uses the temperature information to determine the self-discharge rate and
 - watches the accumulator's voltage for a plausibility check of the charge information it determined.
 - and in some cases exchanges encrypted information with the computer in irder to prevent the user from buying cheaper accumulators from other manufactureres.

This computer also provides most of its knowledge to the BIOS/EFI of the computer that passes it to the operating system. Nomally this information is astonishingly reliable so the system will display it in a nearly unfiltered fashion.
Seems like in your case either the battery's controller or the BIOS/EFI gets something wrong or shares bogus information for fields it cannot provide.
If you want to debug it if your system is using acpi all information it can gather can be found in:
 /sys/bus/acpi/drivers/battery/

Kind regards,

        Gunter.

What make and model laptop! ?
What is the output of :

lsb_release -a; uname -a

Thanks