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If you want to get the max out of your Xperia phone then check out Xperia tips page.

diminished battery power with update (Z5 Premium/dual)

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Learner
Message 21 of 22
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Message 21 of 22

Re: diminished battery power with update (Z5 Premium/dual)

That's the point. WiFi was not on all the time. Neither was the phone active for the 9 hours. Surely this explains the problem, is something not keeping it active that it previously has not done before. 36 hour between charges is usual for me, I have used Xperia for over 5 years now and never had a problem like this.
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Learner
Message 22 of 22
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Message 22 of 22

Re: diminished battery power with update (Z5 Premium/dual)

I love my z5 premium battery life battery 🔋