Replacing batteries will speed up phones, Apple says. Here, an iPhone is seen being repaired in a shop in New York. Eduardo Munoz/Reuters hide caption
iPhone 6
Apple says that it slows the processors in some of its older phones, such as its iPhone 6s Plus, to match their aging, less powerful batteries. Cole Bennetts/Getty Images hide caption
Apple CEO Tim Cook discusses the iPhone 6 and iPhone 6 Plus late last year. Marcio Jose Sanchez/AP hide caption
People walk near several buildings of a Pegatron factory in Shanghai, China, in July 2013. Pegatron is a supplier for Apple products. Eugene Hoshiko/AP hide caption