If you have an iPhone 5, you may have noticed the battery isn’t lasting as long as you’d like it to.

Apple says a very small percentage of iPhone 5 smartphones may suddenly have a shorter battery life.

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The affected phones were sold between September 2012 and January 2013, and only have certain serial numbers.

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The company is offering a free replacement.

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To find out if your phone is eligible, visit their website here.