I don't know if it matters but I have been getting great battery life on my Z10. I am into the 14th hour which included surfing, email, BBM, BBM video chat and some photos. I had a few reboots earlier on but now I just run my battery dry and pop in my spare and charge the dead one. No reboots since I have not used the charger on the phone. The few reboots I had were always while charging. Not enough to get upset about. It's a great phone. The issues will be fixed in time. Have you ever seen Macrumors.com? The Iphone is really not as issue free as people would like everyone to believe. Any way like I said, For what it's worth
Can we swap phones? I think mine would drain the oil reserves of Saudi Arabia in under 2.5 hours if it had the chance - worst battery I've ever had in a phone.
Have you tried conditioning the battery by running it down until the phone shuts off and then charging it? My battery life is definitely better swapping batteries and externally charging. The battery now is at 75% after 6 hours. Battery swapping isn't that big a deal. You have to tie yourself to a charger one way or another sooner or later. I'm happy with the phone. But there seems to be some quality problems somewhere. By the way mine is a -4 on Verizon made in Canada.