Apple has dealt with claims by an app firm that states the manufacturer of iPhones slows down the operation of older phones.

On Monday, the site Primate Labs, a company which makes an program for measuring the speed of an iPhone’s processor, printed data that seemed to show slower performance from the Apple’s iPhone 6sand iPhone 7 models since they aged.

Apple on Wednesday acknowledged that the company does take a few measures to decrease power demands – which can have the effect of slowing the chip – if a phone’s battery is having difficulty providing the peak current that the processor needs.

The problem stems from how all lithium-ion batteries, not just those located in Apple products, degrade and have problems supplying the big bursts as they age and collect charging cycles, Apple said in a statement. The issues with peak present draws may also happen when batteries are low or cold on charge.

“Last year we published a characteristic to get iPhone 6, iPhone 6s, and iPhone SE to smooth out the instantaneous peaks only when needed to stop the apparatus from unexpectedly shutting down through those conditions,” Apple said in an emailed statement to Reuters. “We have now expanded that attribute to iPhone 7 with iOS 11.2, and plan to add support for some other products in the future.”

When an iPhone’s chip produces a big present draw out of a flagging battery, the battery may deliver the current in spikes which has the potential to harm the phone’s electronics. As a result, iPhones would abruptly shut down to protect the pricey processor from being damaged by the power spikes.

The sudden shutdown problem became widespread among iPhones in late 2016, forcing Apple to issue a software fix that had the net effect of slowing the phone marginally with an old, cold or low-charged battery, the business said.

The problem can be remedied by replacing the cell telephone’s battery. Apple costs $79 (roughly Rs. 5,000) to substitute batteries not covered under the telephone’s warranty. The business has long faced criticism from fix advocates for making its own batteries hard for users to substitute by themselves.