iPhone 8 Plus does not pickup battery health after replacement

[DeonH]

Hi all and thank you for your help.

I had my iPhone's battery replaced last week Thursday. The old battery was swollen. (Still don't exactly why.)
Replacement was done by a reputable company who has done screen replacements on my older iPhones as well.
I did as I was advised and did three complete charge-discharge cycles.
What happened then is that the phone will go dead at about 46%. When I then start it up again I don't need to put in Phone code or SIM pin. And when I charge it again, it starts from ±45%. According to the company, they replaced it with an original battery.
I told him what the phone was doing and he advised that I bring back the phone as the battery was most likely not correctly initialised. He said he will start up a new battery taking it through 3 complete charging cycles.
He also showed me the battery managing option on m phone, something I did not even know exist.
Next to the Capacity (or something) it says "Service". When I click on "Service" there is a - where percentage battery capacity should be. (I checked on my wife's iPhone 8 and my old iP 6.) He advised me that it will reset itself after another charge or so. It also displays this message: "This iPhone is unable to determine battery health."
In the mean time I have read a lot about this and it seems like a common thing on iPhones after a battery replacement.
Now I am in doubt as what to do next. I believe the technician when he says he replaced it with an original Apple battery but also cannot leave it like this.
I will appreciate any advice on what to do next.
Thanks.

 

[reactor_sa]

I don't know iPhone but sounds like a fake battery to me

 

[upup]

Hi all and thank you for your help.

I had my iPhone's battery replaced last week Thursday. The old battery was swollen. (Still don't exactly why.)
Replacement was done by a reputable company who has done screen replacements on my older iPhones as well.
I did as I was advised and did three complete charge-discharge cycles.
What happened then is that the phone will go dead at about 46%. When I then start it up again I don't need to put in Phone code or SIM pin. And when I charge it again, it starts from ±45%. According to the company, they replaced it with an original battery.
I told him what the phone was doing and he advised that I bring back the phone as the battery was most likely not correctly initialised. He said he will start up a new battery taking it through 3 complete charging cycles.
He also showed me the battery managing option on m phone, something I did not even know exist.
Next to the Capacity (or something) it says "Service". When I click on "Service" there is a - where percentage battery capacity should be. (I checked on my wife's iPhone 8 and my old iP 6.) He advised me that it will reset itself after another charge or so. It also displays this message: "This iPhone is unable to determine battery health."
In the mean time I have read a lot about this and it seems like a common thing on iPhones after a battery replacement.
Now I am in doubt as what to do next. I believe the technician when he says he replaced it with an original Apple battery but also cannot leave it like this.
I will appreciate any advice on what to do next.
Thanks.

Original fake battery. Take it back. Also I am not familiar with Apple.

 

[quovadis]

If the phone is going dead at 45% there's a problem. Take it back and get them to fix it. I've done 4 battery service swaps at Apple stores in the US on different phones - none of those had any issues and the battery health indicators work fine. They never instruct you to do any initialization charges and all phones are at capacity when returned. Being reputable and being Apple authorised are two different things.

 

[DeonH]

If the phone is going dead at 45% there's a problem. Take it back and get them to fix it. I've done 4 battery service swaps at Apple stores in the US on different phones - none of those had any issues and the battery health indicators work fine. They never instruct you to do any initialization charges and all phones are at capacity when returned. Being reputable and being Apple authorised are two different things.

Thank you. I searched also all over the internet and never came across something like initialising the battery. Yes, reputable and authorised are two completely different things. Thank you for your confirmation of my thoughts.

 

[Spizz]

Thank you. I searched also all over the internet and never came across something like initialising the battery. Yes, reputable and authorised are two completely different things. Thank you for your confirmation of my thoughts.

I've replaced 2 batteries with generic and never had any problem like this. Also, the generic batteries tend not to show the battery health, although the one I replaced in the UK last year does. The one I replaced at Cellucity doesn't.