Battery life has been an ongoing issue for some iOS 5 users, particularly those with iPhone 4 and iPhone 4S. The recent iOS 5.1 update aimed to fix that with “improved battery life” mentioned in the release notes, but just how improved is it? With casual use since the update was released, the consensus at OSXDaily suggests the improvement is substantial, and thus if you haven’t updated your iPhone, iPad, or iPod touch to iOS 5.1 yet, it is highly recommended to do so now.
Every user is going to notice different gains depending on their device usage and general battery health, but overall the improvements seem to be most noticeable on cellular iOS devices, particularly iPhone 4S, iPhone 4, and iPad 2 3G models. The assumption is that some of the potential location services issues has been resolved, though its certainly worth mentioning that users of the standard Wi-Fi models and iPod touch also report a nice boost, even if it doesn’t seem to be quite as dramatic (likewise, the original drain problem usually wasn’t as bad either).