iPhone won't turn on after being left without charge

Call Apple Support and ask for remote diagnostics and they’ll walk you through different ways to restart your device.

If you’re in the US please call 1-800-MY-APPLE or outside the US, consult the support articles below.

Contact Apple for support and service - Apple Support

If your iPhone still has the original battery, which came with the phone, it likely needed to be replaced long ago. The simple fact is Lion Batteries, especially really old Lion Batteries, when fully discharged, can die. It sounds like your battery died to me. Whether it would be a good investment to pay Apple to replace the battery is a decision you need to make. I wouldn't pay to have the battery replaced personally. The phone is forever frozen at iOS 15.8.3, it can't run iOS 16, iOS 17 or iOS 18. Many apps are no longer supported on phones which can't run iOS versions higher than iOS 15. If it were my iPhone, I'd have it checked at your Apple Store Genius Bar, but if it is the battery, I'd invest in a new iPhone.

In addition to lobsterghost1 excellent advice, leaving a battery in storage without a charge will permanently damage a battery and you’re holding the proof in your hand. Even if you do get it to hold a charge it will never perform properly. Just replace the battery.

mvcmwo wrote:

By the way it’s a iPhone 13 mini!

Your tag line says it's an iPhone 7. If it's an iPhone 13 Mini, the battery could still be the issue, but you should schedule an appointment at your Apple Store Genius Bar for evaluation and options.

I know this might not help, and depending on the device you have, it's probably not this problem that I have. But I am going to say anyway.

I have a random iPhone SE or 7 or something near that generation, and since it is a bit of generations behind, it of course may run slower. But I tried charging it for hours and absolutely no battery symbol came up. Anyway, it COULD be that.

What device will you be using, iPad or what?

Just realized theres a iphone description. It's a high chance its maybe just old? I have seen so many people have such old iphones but I do not know if it is the SE models or the actual iPhone 7's.