Device owners have taken to the Cupertino firm's Discussion Forums to report that the incremental operating upgrade has proven to be a drain on power.
Users on the Digital Spy forums have also experienced problems with the download, which was intended to correct WiFi issues.
Twin wrote: "I had no problems with my iPhone 5 at all. Then today I upgraded to iOS 6.0.2 and I have huge wifi problems. It keeps dropping the connection. Is anyone else? Can I undo the upgrade?"
Late 8 added: "I get stalls and skips, poor App store (sluggish to load and scroll) and Safari plays up - loss of back button, stalling loading web pages."
Other DS forum members have reported no change to their power consumption, while others believe there may even have been some improvement.
Apple is yet to comment on the reports of increased battery drain.