Battery message on iPhone 12mini

I bought my daughter an iPhone 12mini for Christmas 2020, there was a fault with the back camera in around February 2021, I contacted Apple support and they replaced the phone for me. Everything has been fine with the phone until now. It has started to display this message on her screen and the battery now drains very quickly. I have googled it, and it states it's likely not a genuine Apple battery, however the battery hasn't been changed/touched? Is there any other way to solve this problem? Or do I need to contact Apple support again? Thank you in advance.