Not much point- I already had detailed diagnostics done in store. Battery OK, iPhone OK. No apps are draining the battery, but ever since the 10.3.2 update, the iOS software ITSELF is draining it at twice the speed of sound.
My husband bought his iphone the same day and it's OK (and I appreciate that many others aren't having a problem either) but after my experience I doubt he'll ever be prepared to update his software again, and nor will many of my family, friends or colleagues. Two friends do have the same battery drain problem since the update and evidently so do lots of people on this forum. And it has nothing to do with a bad battery or not knowing how to use the battery saver setting etc etc. If an iPhone is only good till the warranty runs out, then Apple have really lost the plot, and have also lost me & mine as future customers, but as the service guy in the Brisbane Apple store said - so what?
The update destroyed a phone I could barely afford in the first place. It's certainly taught me how easy it is to live without all the latest greatest products, and that's a lesson I won't forget. I'll buy as cheap as reasonably possible from now on - much easier to replace when it gets destroyed through poor engineering by a company that just wants to sell you something else you can't afford.