HT4993 Why is my battery drained after I did a software update?

I just did the new software update for my Iphone 4s last night, it was on the charger all night until 12 noon today, I have not used it in excess since then. As of now, almost 5pm in the afternoon, it's battery droped to 12%. I have only used a few apps and closed them completely when done with them. Sending a simple text drained the battery by 1%. I plugged it in to charge and left it for an hour and the battery only gained to 15%. Is the software update causing issues now? I am very displeased with this and need to know what to do.

read this and see if it helps: http://osxdaily.com/2014/02/26/battery-life-ios-7-0-6/

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Shirley 123 wrote:
Same issue here! I've been reading on my fully-charged iPad and the battery is down to 78%. Never did this before the latest update. Yesterday, iPad quit before my usual evening reading! Any solutions!
I have personally seen the problem and corrected it on numerous models now including the 4S, 4, 3GS and iPad 2s. Corrupt system level settings created by an iOS 5 bug in the original release that caused battery recalibration issues, etc. Just installing the update does not fix the issue in most cases (sometime it initially can be worse). You need to clear out those settings and recalibate the battery. For those still having the "standby battery drain" issue follow the procedure below in order. It does fix the problem in most cases.
Go through these steps to address the battery after updating to iOS 5.0.1:
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3. Turn off system location services timezone and iAd
4. Fully discharge battery (tilll it shuts off with the spinning wheel)
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More details on my thread here if needed:https://discussions.apple.com/thread/3484755

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Regards.

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ckuan wrote:
Jonathan wrote:
So my iPhone 5 always had the problem of disconnecting from the wifi signal I was on whenever the iPhone is locked.
Per designed, Wi-Fi will disconnect in sleep mode to save battery.
If you want Wi-Fi to stay connected even in sleep mode, plugin to a wall power socket.
No it's not "per design". It's not supposed to disconnect when locked/in sleep mode. The whole concept of having live notifications to work when your phone is locked is the standard for smartphones. Having this feature only accessable when pluging/charging the phone is rediculous and counter-productive. But it's good to know that I'm not the only one who has this issue. I hope all our issues are solved swiftly, good luck to you all

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After updating my Lumia 1520 to 8.1 Cyan update, the battery drain is very high. The battery is lasting only for 6 to 7 hours when the data traffic is on (under mixed use of 2G and 3G modes). I have noticed few other users were also experiencing heavy battery drain after the Cyan update.
Will there be an update to fix this battery drain issue?
When the phone was in WP 8 Lumia Black update, battery backup was around 24-30 hrs (when data traffic was on).
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Moderator's note: We have provided a subject-related title to help other forum users easily view and respond to this post.
Solved!
Go to Solution.

Yep, my 1520 battery drains like a helicopter that's lost it's rotor after this 8.1 update.
I was just boasting last weekend how awesome the battery life was on this phone, I drove 300mi with the GPS w/navigation, did some tethering to my laptop for work, went overnight..no charging, used lightly all the next day, few pictures, email, browsing, phone calls, and drove 300mi back on GPS/navigation and I still had 38% battery left.
I updated to 8.1 sunday night, and on my normal commute to a customer in another state, which under 8.0 would have drained oh...mabey 4-5%, I was at 62% by the time I got to this customer yesteday.
All I did was make a phone call, that's it. All background stuff is not allowed. location off, cortana off, ...still drains.
Bad bad bad news. I'm not seeing much usefull ness out of 8.1, and considering the battery life and no real new features....just gimmicks if you ask me, I'm not sure I want to stay at 8.1 . I'm trying to give it a chance...battery life is still better than my POS samsung androids I've had in the past, but knowing how good it really can be...and no real features in 8.1 (I was hopeing they'd fix the imap email not allowed to map sent/trash/inbox issue)....eshh...what a mess it seems.

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I did what you said in your 2nd post, and recharged the battery. after 6 hours, it was the charge was still at 100%!
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Double check that your Network settings are how you want them as after an upgrade they have a habit of changing.
On my Verizon phone it redefaulted to Global which really burned my battery instead of limiting it to LTE/CDMA, once I changed it back battery life was back (or better) than previously.

HT4993 Why is my battery drained after I did a software update?

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