Apple will reimburse customers who paid full price for iPhone battery replacements.

The $50 credits will be issued to users who paid for out-of-warranty iPhone battery swaps between Jan. 1, 2017 and Dec. 28, 2017, Apple said. The credits apply to battery replacements by Apple Stores or authorized Apple repair providers, and cover iPhone 6 or later devices. Apple said it will email eligible customers about obtaining the credit by July 27.

Apple disclosed late last year that its iPhone software intentionally slowed down the performance of older iPhones with aging batteries to avoid random shutdowns. The company said that new batteries stopped the slowdowns and offered $29 battery replacements, a $50 discount.

Those who replaced their batteries before the program went into place will now get that discount as well.