Originally Posted by charliecc
My battery usage has been amazing since 4.0.4 (IMM76I), it's at least 50% better, perhaps more. FYI, I have the GSM model.
Current battery stats with low/moderate usage.
31% charged, 2days exactly since last charge.
Update, I'm back to normal battery usage now, and I think I know why.
When I updated to 4.0.4 I was at home and the phone was connected to wi-fi pretty much exclusively for those first 2 days. When I left the house on the weekend I was trying to browse the web using network data, nothing, it was totally dead.
I could still make phone calls but no data transfer at all. I did some googling when I got in, and apparently this had happened to a few people when they installed 4.0.4 and all that was required was a reboot. So I rebooted and now it's fine. However, my battery usage has gone back to normal, as I type I'm 35% on 24hrs with the same usage as before.
So it looks like having 3G (network data) off made all the difference.