(CBS) -- When John Poole, a Canadian computer scientist, set out to figure out why the performance of his wife's iPhone seemed poor, he says he made a surprising discovery.
In order to sustain the life of its device, he says Apple is deliberately limiting the power the battery sends to the phone's processor-which runs apps and other functions.
"At this point in time, the only fix is to replace the battery," he says.
Apple now confirms it's been slowing phones. It says the issue began when its iPhone 6 experienced sudden shut-downs last year. Older batteries were struggling to keep up with the phone, so the company offered a limited battery replacement program and a software update.
The company now admits that update slowed the phones down.
In a statement to CBS This Morning, Apple says: "Our goal is to deliver the best experience for customers, which includes overall performance and prolonging the life of their devices."
You can solve this problem by replacing the battery but, if your device is not under warranty, Apple charges $79 for a new one.
The company says "this impacts all lithium-ion batteries in the industry," but Poole told us-in his testing-other mobile phone brands do not seem to be experiencing these issues.