Battery problem (Acer f 15 f5-573g)

I just bought an Acer laptop a month ago.

this computer ,well , acts kind of weird . the battery full charge capicity changes like crazy (I check using HWmonitor,BatteryMon and powercfg/batteryreport in cmd-all three give the same result).

sometimes it goes up, sometime goes down . from 1% lost in full charge to 3% and back to 1%. 1% in one month means I will lose only about 12% in a year ,but 3% is  a different story . and more ,in each battery report made by   powercfg/batteryreport ,there is a chart called Battery capacity history .Here is one from July 28th :

  Battery capacity history

and here is one from today ,July 31st : Battery capacity history

 two charts showing different results.

and here is battery full charge capacity reported in July 28th 

Battery report

Installed batteries

 it's also different from the chart made on July 31st above ?

I have made a lot of these everyday, a few per day, battery capacity always changed when discharged ,like downto 35% or less.

please answer me if this battery is faulty and need replacement .

thanks.

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