This is not the first time Apple has had batteries swell within new devices. The company manufactures and sells between 40m and 80m iPhones a quarter, a volume that means isolated issues are likely whether it be through manufacturing defects or problems during shipping.
But the spotlight has been shone on battery issues following the disastrous problems faced by Samsung with it’s 2016 Galaxy Note 7. Battery design and manufacturing issues led to Note 7s catching fire. The company recalled devices and shipped out a second batch with a different battery from another supplier, but it too suffered similar issues, leading to the company permanently recalling and discontinuing the smartphone, which cost Samsung billions.