One user tweeted: 'Anyone else having AWFUL battery life on iOS 15.6?'
Another added: 'I did a fresh install of iOS 15.6 on my 13 Pro two days ago, and so far this is the battery life I'm getting.
'Took it off charge at 6:30 AM this morning, it is now almost 15 hours later and I'm sitting at 28% battery left.
'And today was a more light day use than usual.'
And one vented: 'Really loving the iOS 15.6 iPhone update where my battery goes from 100% to 9% in an hour, when for 1.5 years I'd go the whole day and still have 50% left.'