Why my new battery discharging cycle is over 900

i bought a s6 battery from ifixit site at december 2, 2018.

firstly when i reinstall my battery, i saw over 900 times discharge cycle.

also, battery health is drop down 95 to 90 within week.

now, it show 86.71

samsung info app could show error information, so i check several different app to check about it. they show all same discharge cycle and battery is already bad.

do they send me old battery or is there anything i need to.

also i charge my phone between 70 - 75.