It appears that Apple has again failed to fix the ongoing iOS 5 battery drain issue on the iOS devices, especially with the newer iPhone 4S devices which come up with pre-installed iOS 5 on it. Apple has been already tried to fix the issue with two or more betas of iOS 5.0.1 with developers but appears to be failed in achieving the mark. This week, Apple has seeded the first beta of iOS 5.1 to developers with a lot of new buzzes for the rumor mill regarding the new devices launch, but it seems that nothing has been changed in the iOS 5.1 beta release.

As tested by the users around the iPhone forums, the iOS battery drain mostly occurs on the latest devices, and Apple has been still struggling to fix the battery drainage on the iPhone 4S. As noted by the ABI Research’s Micheal Morgan, they have tore down the iPhone 4S hardware to find out which hardware is eating the device memory, and founds nothing in the iPhone 4S hardware, which may eat the battery even A5 processor works cool. The analyst has also pointed the batterygate issue due to poor coding in the core of iOS 5 that occurs battery drain on the devices.

“We tore down the 4S and tested some of the major components, including the new A5 processor,” Morgan said. “Nothing that we tested was significantly different from the iPhone 4, and power draw was right where we expected it to be.”