Why does my battery stay at 100% for ages and then plummet at 100mph?

Since I updated to iOS7 my battery meter stays at 100% every bit as long as it did on iOS6 but then once it starts falling it really speeds up. The first 10% go fairly slowly, the second 10% falls even quicker and it continues in this vein. The last 10% is over in a flash. I have calibrated my battery six or seven times in succession and my battery meter always drops to 1%, it never switches off earlier than it should but I just don't understand this non-linear battery meter reading. It never used to act like this in iOS6.

I had this problem over the weekend. It's very annoying.
Anyway, I read your posts and some others and the only thing that's changed on my phone since I was last abroad and didn't have this problem is that I enabled MobileMe to track the location of my phone.
Makes sense.
The app is constantly trying to update apple with the whereabouts of the phone. With data roaming turned off, it can't do it, so tries and tries again and the phone never gets into standby. Make a wifi connection and it's fine for a few hours as it can update the location, but next time it tries if you're off the wifi it'll frantically try again.
This also explains why it doesn't have the problem if data roaming is left on, as it can carry on reporting location as usual (at your expense).
Also, because you configure it in the mail account settings, that explains why you get the message about data roaming being turned off every time you look at your messages.
Try removing the MobileMe account from your phone - you'll see the battery drain goes back to normal.
Apple should fix this bug - they just need to change the app so it checks whether data roaming is turned on or not before updating location. Maybe a message saying MobileMe needs data roaming turned on to work abroad, or maybe it could just check if it's enabled and if not, don't try to make the connection until the phone is no longer roaming. The problem is if your phone is stolen and goes abroad, without MobileMe doing what it's supposed to be doing your data is compromised and you won't have the cool remote erasing functionality etc.
Oh well!

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Lenovo T500 battery stays on %100 for awhile then drops down to %99 for no reason

Hi,
The Lenovo T500 battery stays on %100 for awhile then drops down to %99 for no reason. What's up with this and how do I fix this issue? My laptop is really confusing me. The green battery says it's totally charged %100 and the little AC adapter icon in the system tray says "%99 available (plugged in, not charging.")
Thanks,
Liz

Hello Liz,
that is considered to be normal.
It´s bettter for a Li-ion battery not to be charged fully, so the powermanager don´t load the whole time.
That´s why the percentage could drop. But thats not a problem thats a feature.
if your battery handling is set to automatic in powermanager then, eveythings is ok.
Do you use your machine with AC plugged in the whole time?
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TIP: If your computer runs satisfactorily now, it may not be necessary to update the system.
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Any reason why my MacBook Pro keeps dropping the WiFi signal - will be fine for ages and then just drops it!, Any reason why my MacBook Pro keeps dropping the WiFi signal - will be fine for ages and then just drops it!

Any reason why my MacBook Pro keeps dropping the WiFi signal - will be fine for ages and then just drops it! Does it at home and work so not either broadband connection

jp270759 wrote:
Hi. MAny thanks for the answer. Am new to Apple - what's the "real" MacBook Pro forum?
I would like to know also!
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http://support.apple.com/kb/TS1920 Mac OS: How to release and renew a DHCP lease
No internet connection (wireless)
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Troubleshooting Wi-Fi issues in OS X Lion and Mac OS X v10.6
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HI and Welcome to Apple Discussions...
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Why does my battery stay at 100% for ages and then plummet at 100mph?

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