With the update of iOS 5.0.1 this past week Apple thought they fixed the Battery Drainage issues faced by people on iOS 5.0. When iOS 5.0.1 was released, the change log stated very clearly that the battery issues are fixed in this update. This time the change log only stated the change made in iOS 5.0.1 and we couldn’t see the change coming to the light. We assume that Apple was so happy to fix the iOS 5.0 bug founded by Charles Miller for the Untethered Jailbreak that they never paid close attention to the battery issues on iPhone 4S.

When Apple released iOS 5.0.1, many of the iPhone 4S users updated for the sake and hope of fixing the massive battery drainage and giving up the Jailbreak opportunity. But later on they found out that iOS 5.0.1 is not a fix, though it is a battery killer. The battery was draining very fast on iOS 5.0.1 for iPhone 4S user. Some of them got the issues fixed and some of them got in their worst night mare of the battery issues. When the issue got vast, people started to think that this might be some hardware problem because Apple accelerated the production of iPhone 4S in order to meet the demand, might have let the issues in it.

Thankfully, no. It is not a hardware problem. Although no one knows what exactly the problem is but the problem told by a Developer.

According to cultofmac findings:

ZDNet had a clever idea. Let’s take two iPhones 4S’s — one that has battery life issues, and one that doesn’t — and give them to an app developer to test them out. Both phones were bought at the same time, both ran iOS 5.0.1 and were AT&T models. In theory, they should both have the same battery drain problems, but only one did. Why?

After getting the two iPhones, the app developer decided to see if it was a hardware issue, so he backed up both iPhone 4S’s and then factory reset them. No dice.

Tthen he had a clever idea: what if I restored the iPhone 4S with battery drain issues using the backup of the one with no battery problems, and vice versa? If the battery drain issue was a hardware problem, the same phone that had the battery issue before should have problems even with a restore of another iPhone’s backup.

But that’s not what happened. Instead, when the iPhone 4S’s were restored with the other iPhone’s backup, the battery drain issues made a jump from between phones!

While this is only a one test case study, it does seem to conclusively prove that battery drain issues under theiPhone 4S are caused by bad software, not by bad hardware. It also seems to explain why some users have reported that complete wipes of their iPhone 4S without restoring from a backup after sometimes solve the problem.

After going through all of this information, the findings reveal that the problem lies within the software for iPhone 4S. It is also notified that the issue can be resolved by restoring the iPhone and not getting the old backup sometimes work.

Remember Siri Raise to Speak is also a battery Killer. So turn that also off.

We hope that Apple takes this issue seriously and works out on this. If this is really a software issue, So we can expect another update of iOS 5.0.2 some time later.