Why wouldn't my iPhone turn back on?

[iMore Question]

Why wouldn't my iPhone turn back on

Battery was charged, iPhone 4

 

[Rob Phillips]

Re: Why wouldn't my iPhone turn back on

Welcome to iMore! Does your iPhone 4 still have its original battery? Apple's iPhone batteries are designed to retain 80% of their original capacity for 500 full charge cycles. After that you're on borrowed time.

Apple offers battery replacement service, depending on your location. More info here: https://support.apple.com/iphone/repair/service

 

[Ledsteplin]

Re: Why wouldn't my iPhone turn back on

The battery in my old iPhone 5 will sometimes discharge way down, and when I try to charge it, it takes an hour just to start showing the battery on the screen. It's on charge cycle 1154 at about 30% health. They do fine down to around 50%. Then it begins. The 4 is old now. If you can't possibly upgrade, at least buy a new battery.