Why does my phone charge (lumia 640 LTE win 10) up to 75-6% only?

AIDA64/Battery
Level :74%
Status :Discharging
Remaining battery time : 21h53m
Discharging rate: 801 mW
Designed Capacity : 9500mWh
Fully charged Capacity : 9500mWh
Remaining capacity: 7030mWh
Wear level : 0%

what is going on? Battery was bought from windows shop 3 days ago? 1/4 of battery can really help if i get it back...

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