User level: Level 1 (4 points)Are the battery tests from iab accurate? Why is it that only the iPhone 15's test results keep dropping, while other models remain stable or even improve? In real use, the iPhone 15's battery life really isn't as good as before.
Posted on Sep 18, 2026 6:16 PM
User level: Level 10 (105,996 points)Sep 18, 2026 8:03 PM in response to 恩泽240
恩泽240 wrote:
Could this be a software issue? Battery life has definitely decreased since the software update,even a week later(it shouldn't take a week to index, right)
After any of the updates it takes about 4 days, with iOS 27 there is additional indexing being performed for Siri so yes it may take longer. Since iOS 27 was just released Monday, it has only been 4 days so far. Make sure you are leaving your device connected to Wifi and plugged into power all night, every night to allow the indexing to process faster. Not only should you expect increased battery drain during this time, but expect your phone to run warmer and there may be some UI lag, which is all detailed in the Support Article here:
About Apple software updates - Apple Support
I would give it a couple more days still, then post the 2 battery graphs and the top 5 apps consuming your battery at Settings > Battery > View All Usage. Also post your Battery Health percentage.
User level: Level 10 (244,490 points)Sep 18, 2026 6:31 PM in response to 恩泽240
No one in this user-to-user forum can answer anything about any 3rd party testing procedures or results. How many phones did they test? It would have to be at least a hundred of each model, because there are substantial variations between different phones of the same model. Did they actually by 300 new iPhones? Did the phone meet Apple’s design goal of 500 full charge cycles to stay above 80% (1000 for iPhone 15 and higher)? It certainly looks like every model in their test met that design standard, as none were below 80%.
My SWAG is that they didn’t know what they were doing.
User level: Level 1 (4 points)Sep 18, 2026 8:17 PM in response to Mac Jim ID
I upgraded from iOS 27 Public Beta RC to the official version, does that also take longer time to index? And the settings app show that the indexing is already done. I don't think providing screenshots makes any sense because under similar usage habits and scenarios, iOS 27's battery life on the iPhone 15 isn't great Compared to iOS 26, and it's been the same from beta to release.
User level: Level 1 (4 points)Sep 18, 2026 7:52 PM in response to Lawrence Finch
Could this be a software issue? Battery life has definitely decreased since the software update,even a week later(it shouldn't take a week to index, right)
User level: Level 1 (4 points)Sep 18, 2026 7:54 PM in response to Lawrence Finch
I’m referring to battery runtime, not battery lifespan.
Originally posted at discussions.apple.com/thread/256360141