In a letter addressed to the U.S. lawmakers, Apple said earlier this month that it was seeing "strong demand" for replacement iPhone batteries. The company added that it may offer rebates for consumers who paid full price for new batteries. From a report: Apple confirmed in December that software to deal with aging batteries in iPhone 6, iPhone 6s and iPhone SE models could slow down performance. The company apologized and lowered the price of battery replacements for affected models from $79 to $29. In the letter released Tuesday, amid nagging allegations that it slowed down phones with older batteries as a way to push people into buying new phones, the company said it was considering issuing rebates to consumers who paid full price for replacement batteries.