IPhone XS battery drain

[GMac11]

Hi folks, some help/insight required.

I bought a ‘refurbished’ xs for my mum last week for her birthday this week. I set the phone up on Thursday and it pretty much sat in the box since. I wanted to show my brother yesterday and when I opened it up the battery was totally dead. Thought it was odd but charged it again nonetheless. Again since yesterday (5pm) it has gone from 100% to 40% just sitting on my desk.
There is no SIM in it although it is connected to wifi. I have checked the battery stats and nothing is showing as using the battery out of the ordinary yet there is a steady and consistent decline on the graph.
The battery health is 100% so I thought it should be ok but is it possible even though it says 100% it is far from it?

I do have a returns period so is there something I’m doing wrong or should I just return now and have done with it?

Thanks.

 

[GMac11]

Thanks all for the replies.

Charge it up and put it in Airplane mode with WiFi off (do it in settings not via control centre).

This is Plan A. I will charge this evening when I get home and see how that goes.

New battery from the likes of replacebase.

This was one of my first thoughts.

Is it restoring from a backup? Downloading photo library?

Not restoring anything. I initially signed into my own Apple account for the initial setup to inspect the phone and I made sure to turn all the restore features off. Even at that there’s very little on mine. My own iPhone 12 didn’t have any issues.

Refurbished by who?

It was a Marketplace purchase on Amazon. Sold as refurbished and presumably by the company I bought it from.
I allow for issues such as this and made sure it was a Prime eligible purchase etc so I should have no issue with a return.

 

[GMac11]

I take that as 'cleaned with an IPA soaked rag, reset and put in the box'

Not beyond the bounds of possibility! I’ve never bought refurbished through Amazon before but I’ve heard some horror stories about the quality control. That being said to buy a second hand unit with 3 years of wear on the battery isn’t ideal either.
That’s the problem when your remit is get an iPhone (explicitly NOT the SE) for £400 or less...