Bloomberg has partnered with iFixit to provide a high-resolution look at how the inside of the iPhone has changed since first launching a decade ago: the latest model has (obviously) improved drastically in comparison to the first, which was equipped with a bulky, yellow lithium-ion battery rated for 1,400 mAh. Apple said that was good enough for up to eight hours of talk time, six hours of web browsing, seven hours of video playback, or 24 hours of audio playback at the time. The story of the device’s evolution is readily available to anyone willing to crack an old phone open and look at what’s inside. To understand this, we partnered with iFixit, the website known for publishing detailed “teardowns” of each phone, and IHS Markit, which produces estimates of the cost of electronics components. Then, with an EBay account and a little help from Sunny Lin, the founder of Simple Mac, an iPhone repair shop in New York, we got our hands on each iPhone model and opened them up. Here are the results.