Lenovo Y40, false 100% charge.

My Lenovo Y40-70 registers 100% charge left on the battery, but it will randomly shut off and/or go to 0% charge.
It is under warranty, but I would like to be able to fix this myself. What is the issue? Is it simply a defective battery. (The Lenovo I have is 9 months old)

hi Patton370,
Welcome to the Forums.
Can you download and run BatteryInfoView to get a rough info and status about the battery.
- Sample image
If you see a wide gap between the Full Charged Capactity and the Designed Capacity then it's likely that one of the battery cells is wearing down (it maybe due to heat, daily use, and age). In this scenario, the battery cell(s) lose the charge capacity faster than others cells.
In addition, take a note of thee battery features:
Voltage tap
Most consumer equipment treats a stack of cells as a single battery, but this can be dangerous in lithium ion. As the cells age, some will lose capacity faster than others -- and if one cell becomes flat before the others, it can actually start to charge in reverse, which is a highly dangerous condition. The internal circuitry of the battery pack thus has to monitor cells separately and shut down the whole pack if one cell is too far out of balance.
Battery charge state monitor
Many lithium ion packs have a built-in meter consisting of a row of LEDs and a button. To accurately report the state of charge, the pack electronics has to keep a record of the current in and out of the cell, as well as a model of its behaviour. This can become more inaccurate over time; more modern cells will recalibrate themselves.
The false 100% charge that you're getting is possibly due to the inaccurate reading of the battery charge state monitor and the sudden shutdown that you're experiencing may have triggered been triggered by the Voltage Tap (it likely detected an abnormal activity in one of the cells that's wearing out and shuts off the battery). In this case, resetting the battery guage or doing one discharge cycle won't fix the problem and a replacement battery is necessary.
More info:
Teardown: Anatomy of a Failed Aftermarket Laptop Battery
Inside a notebook battery pack
Regards

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Hey folks,
im sorry, im probably in the wrong theard!
I have a problem with my new! Lenovo G500s.
When i have my charger on my notebook it doesn't charge. There is standing:"Network operating will not be charge".
The realy bad thing is, that wehn i didn't have my cable on my Notebook it lives not longer than about 15 minutes. After these 15 minutes my screen is black and i can not start my Notebook. I have to charge again, and wait over hours to start my notebook again.
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hi Felix,
Welcome to the Lenovo Forums.
Just to verify, when you turn off the computer and plugin the charger, can you observe the battery light indicators and see if you're able to charge the battery.
G500s Battery Status Indicators
On the other hand, 15mins battery life is very low. If you have a 100% charged battery and it only last 15mins I would recommend calling Lenovo support as there's most likely a problem with the battery.
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My battery life at a full 100% charge is about 2 hours 22 minutes (backlight and key lights at lowest level). Should I go complaining to Apple or do I just need different software?

My battery life at a full 100% charge is about 2 hours 22 minutes (backlight and key lights at lowest level). Should I go complaining to Apple or do I just need different software? I've only had my mac book since August 2011. The battery dies in 2 to 3 hours with some web surfing (little video play) and photo editing etc. I really don't feel like taking my computer all the way to the apple store to wait there for 5 hours to hear that I need to call someone blah blah blah. Any advice? (BTW Safari hasn't been working since I last updated my mac, WHYYYY?)

emsavage1127 wrote:
Should I go complaining to Apple or do I just need different software?
emsavage1127 wrote:
I really don't feel like taking my computer all the way to the apple store to wait there for 5 hours to hear that I need to call someone blah blah blah.
Make an appointment at the genius bar, that way, you wont have to wait. http://www.apple.com/retail/geniusbar/

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Hello
I have just purchased a Lenovo Y40-70 laptop with preinstalled Windows 8.1 OS. I am trying to figure out how to downgrade to Windows 7 with a purchased OEM disk because of the lack of support of Windows 8.1 with many of the software packages I use for work.
After doing some research, the concept of GPT vs MBR hard drive disks kept coming up. Until receiently, I was under the impression that to downgrade to Windows 7, I would have to convert my HDD from GPT to MBR by deleting everything that was on it and reformatting it. This concept scares me because of the possible loss of my Windows 8.1 OS. It should be said that this laptop is completely new and no personal data or programs have been added.
Recently, I came across a support document written by Lenovo that describes how to downgrade to Windows 7 for many of the ThinkPad computer models. The problem is that my laptop is not a ThinkPad but was associated with the referred document(http://support.lenovo.com/en/documents/ht075596) with the use of their search wizard.
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This is probably not what you want to hear.
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Question 3. I think you need to read this, http://www.howtogeek.com/193669/whats-the-difference-between-gpt-and-mbr-when-partitioning-a-drive/
But I have another option for you. Have you ever thought of using a Virtual PC on the Windows 8 machine. You can run Windows 7 on Windows 8.1 and leave windows 8.1 intact. You can also install al your software on Windows 7 and run it in the virtual environment.
Also Windows 8.1 has compatibility mode just as older versions of Windows did. Have you tried installing the software in compatibility mode?
Hoov
Microsoft MVP - Consumer Security
SpywareHammer.com

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Lenovo Y40, false 100% charge.

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