iPhone 4

Powers phone, weighs less, charge quickly

Amperex Technology Limited

• Hong Kong, China

• 3503 Wharf Cable TV Tower 9 Hoi Shing Road, Tsuen Wan N.T., Hong Kong
  Tel: +852-2498-0908 Fax: +852-2498-1101

iPhone 4: 2011

It was rumored that Apple changed battery providers in 2013

• Shuiyu J. & Meidong H., (2018) Battery Giant Buys Stake in Lithium Firm. China Daily. Retrieved from: http://www.chinadaily.com.cn/a/201803/14/WS5aa88351a3106e7dcc1418bd.html

• Etherington, D. (2013). Apple Reportedly Changes Battery Suppliers as Samsung Walks. Tech Crunch. Retrieved from https://techcrunch.com/2012/11/23/apple-reportedly-changes-battery-suppliers-as-samsung-walks/