iPhone XS Max Is it another apple battery or an after market

[Box2secure]

Pls can you help me with the genuinity of my iPhone XS Max I got on the used market the battery section says degraded service and still no maximum capacity is shown that field is blank like a dash there but when I checked the iPhone battery cycle count it read 69 and it still last a day use as would a good battery I asked the seller he claims battery was not change pls even though I think it was changed why would the service degraded battery just not go

 

[Shadowbech]

Appears to be aftermarket. If it was OEM it would have read the max capacity.

 

[now i see it]

Aftermarket batteries won’t show up on the battery health data. They’re likely missing an Apple proprietary embedded chip.

 

[BugeyeSTI]

3rd party battery for sure