Cupertino, Calif.-based Apple recently rolled out an update to its iOS software to fix a battery drain bug, but some users still complain that the update did nothing to address the battery issues.
The update, iOS 5.0.1, was released on Thursday, with a promise that it would fix the battery issues.
The update was released following a number of customers had reported lower than expected battery life on their iOS5 devices.
But by Friday, a number of users took to social networking site Twitter and some other platforms to discuss the ongoing battery problems.
The complaints prompted Apple to confirm that continued to investigate the issues pertaining battery life of the iOS5 devices.
Speaking on the topic, a spokesperson for the company said, "The recent iOS software update addressed many of the battery issues that some customers experienced on their iOS5 devices. And we continue to investigate a few remaining issues." One of the complainants said that his iPhone 4S had gone down to 34 per cent battery in merely 7 hours, even after updating the device to the iOS 5.0.1.