“Even a small percentage [of customers] opting for battery replacement over upgrade could have meaningful impact on iPhone sales,” he wrote in a note on Wednesday.

Apple recently said it intentionally slows iPhones with older batteries to prevent the handsets abruptly shutting down. The Cupertino, California-based company stressed that it hadn’t intentionally slowed the devices to encourage users to purchase newer models. In response to customer complaints, Apple apologized and cut the price of replacement batteries from US$79 to $29 for many older iPhones.

While analysts agree this was a good public-relations move, some are concerned it will dent future sales of iPhones, a product that accounts for roughly two-thirds of Apple’s revenue. The company’s stock rose almost 50 percent last year, largely on hopes for a “super cycle” with the new iPhone X and 8, where a large number of users upgrade.

Read also: Android phone makers assure customers: ‘We don’t slow down our smartphones’

Moskowitz estimates around 519 million users are eligible for the battery offer, and that in the most likely scenario 10 percent take the $29 offer, and about 30 percent of those people decide not to buy a new iPhone this year. This means Apple could miss out on 16 million iPhone upgrades in 2018, the analyst said. 

Apple shares rose 0.6 percent to $173.28 in early afternoon trading in New York. The stock was up as much as 1.3 percent earlier in the day.

The battery program will only be in effect through the end of the year, and there are also other reasons for iPhone users to upgrade. An Apple spokeswoman declined to comment.

— With assistance by Mark Gurman, and Alex Webb

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