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I know each release comes out with new features and improvements that probably cause further battery drain. But has anyone looked into the specifics of why this

I know each release comes out with new features and improvements that probably cause further battery drain. But has anyone looked into the specifics of why this happens year over year? Couldn't they spend time optimizing battery life? Is there no incentive to? Especially with screens becoming relatively larger and batteries remaining the same, I think battery life is a valid selling point for many consumers. I'm sure Apple does a ton of market research in this area, so maybe I'm wrong.

wellsjohnston 9y ago
They are incentivized to give new phones better battery life, while being disincentivized to optimize battery life for previous generation iPhones.
- noitsnot 9y ago
  Right, this is true for software in general. You don't optimize for out-of-date hardware and an older battery is not going to fare well with a new iOS update doing different things with your files and make the adjustments it needs to in the first few days or weeks.