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Hi,
I have purchased Sony Z and from day 1 i m not able use my mobile for entire day. Even though if i m not using it completly battery is discharging quickly...Can any one guide me
Srihari
Settings > power management > battery > check whats draining your battery, keep in mind that leaving your data on, wifi, bluetooth, gps etc on will drain your battery faster. if you have poor network coverage that will be another issue, if you play games that will drain your battery quite fast.
have you enabled STAMINA mode? if not do that and give it few days for it to train itself after usage of your phone after that it will end from training mode and begin to save battery usage
used mine a few times most of time it's still 50-70% at 17:00 swedish time which is 5PM 
If you want the honest answer - I think the battery life of this phone is the worst in the smartphone market.
I used a micromax canvas 4 last week till i got phone from the service centrs back and realised the batter was 4 times better.
absouletly ...even i have used Micromax & Celkon ..they are 100% better than Sony Xperia Z. I have used them and daily i use to browse the sites, email, Listen to music, Calls all this will reduce 50-60% of my battery. If i use it in similar way Z will not able to sustain.
SONY BETTER YOU HAVE TO WORK ON BATTERY.
Sri