The issue threatens Apple’s premium phones, a cash cow essential to its growth and profits.
Heat is enemy No. 1 for smartphone batteries and can lead to irreversible damage.
But at what temperature will you get a warning? And what can you do to limit the impact? WSJ’s Joanna Stern heated up an iPhone and a Samsung Galaxy S to get the answers. Photo illustration: Nayon Cho for The Wall Street JournalDow Jones & Company, Inc. All Rights Reserved. 87990cbe856818d5eddac44c7b1cdeb8
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