"Lithium-ion batteries become less capable of supplying peak current demands when in cold conditions, have a low battery charge or as they age over time, which can result in the device unexpectedly shutting down to protect its electronic components", Apple said in a statement.
Audio will be available later today.
Analysts and customers reported in recent days the iOS updates were causing older models of the phones to slow considerably, with some claiming the updates were being used to encourage purchase of newer model iPhones. The operating system slows down the device to prevent it from shutting down in cold temperature, a low battery charge or very old batteries. But it's largely shrugged off with smartphones - it doesn't help that the battery is not user replaceable. Apple on Wednesday said a software feature released previous year makes your phone operate more slowly to offset problems with its aging lithium ion battery.
The drop in performance has been traced back to a software patch issued to correct the random shutdown issues that affected iPhone 6 and 6S devices earlier this year, the Daily Mail says.
They were reacting to Apple's statement on Wednesday - in response to a claim by an app company earlier this week - that it had introduced a software feature past year to prevent phones from unexpectedly shutting down.
In short, what Apple's doing is occasionally restricting the processor of some old iPhones, specifically those that have batteries that can't hold a proper charge.
The feature, which slows performance to demand less power, has been extended to iPhone 7 handsets with the latest iOS operating software and will be added to other Apple products "in the future", the spokesperson said.
"Our goal is to deliver the best experience for customers".
Apple was responding to research carried out by Geekbench, off the back of a Reddit thread that points to iPhone performance reducing as battery life dwindles. The suit, originally spotted via TMZ, also notes that Apple's behavior lowers the resale value of existing iPhones and underhandedly coerces iPhone owners to upgrade to newer models.
Apple has acknowledged what many have long suspected.
Perhaps more than any other device, iPhone batteries are especially tricky to replace. Coupled with the fact that products like the iPhone X aren't making having the best possible device any cheaper, the proposition of owning an iPhone is becoming an increasingly dicey one, according to him.