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Patton370
Paper Tape
Posts: 1
Registered: ‎05-02-2015
Location: USA
Views: 1,892
Message 1 of 11

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)
Social Support Agent
Social Support Agent
Posts: 5,822
Registered: ‎02-11-2012
Location: PH
Views: 1,839
Message 2 of 11

Re: Lenovo Y40, false 100% charge.

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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copyright3k
What's DOS?
Posts: 3
Registered: ‎08-14-2015
Location: United States
Views: 1,538
Message 3 of 11

Re: Lenovo Y40, false 100% charge.

Hi there, I have the same problem. My Y40 is 8 months old. The battery % does not increase/decrease and is currently stuck at 100%. It was stuck at 7% earlier and I ran the battery gauage reset via Energy Management to get it up to 100%. However, the % levels are still not moving. It is currently stuck at 100%. Here's my battery info:

Capture.PNG

bzat4
Blue Screen Again
Posts: 5
Registered: ‎08-13-2015
Location: USA
Views: 1,524
Message 4 of 11

Re: Lenovo Y40, false 100% charge.

I also have the exact same issue with my Y40.  The support specialist I talked to on the phone said this was not currently a known issue, but sounds like it might be more prevelant than initially thought.

 

I sent in my Y40 to the Grapevine, TX service location and after receiving the diagnosis that the battery needed to be replaced, I was told that the replacement parts are currently out of stock.  As of yesterday, the ETA for the replacement parts is September 7th, so make sure you're okay being without your laptop for a month before you send it in.

 

Would love for someone from Lenovo to comment on both the battery issue and the part shortage.

copyright3k
What's DOS?
Posts: 3
Registered: ‎08-14-2015
Location: United States
Views: 1,513
Message 5 of 11

Re: Lenovo Y40, false 100% charge.

I'm really frustrated. Not only is the charge stuck at 100%, when on battery, the laptop dies after being stuck on 100% for about 30 minutes. When I plug it back in and hard restart, it displays a 1% charge. I suspect something faulty with the battery levels sensors.
PhilBilo15
Punch Card
Posts: 16
Registered: ‎08-26-2015
Location: Saint-Jean-sur-Richelieu
Views: 1,232
Message 6 of 11

Re: Lenovo Y40, false 100% charge.

Your battery wear level is very too much high ! Ypur battery is dead ! This happened to me too ! I have just received my computer back with a new batterg.. I hope that one does not have a default !
VincentOlivier
Punch Card
Posts: 16
Registered: ‎12-30-2014
Views: 842
Message 7 of 11

Re: Lenovo Y40, false 100% charge.

I have the exact same problem
bzat4
Blue Screen Again
Posts: 5
Registered: ‎08-13-2015
Location: USA
Views: 836
Message 8 of 11

Re: Lenovo Y40, false 100% charge.

FYI Vincent, the resolution to my issue was Lenovo diagnosed that my battery was dead and ended up sending me a new laptop since the spare batteries were on backorder.

VincentOlivier
Punch Card
Posts: 16
Registered: ‎12-30-2014
Views: 814
Message 9 of 11

Re: Lenovo Y40, false 100% charge.

I hope they will reply my email! It's weird cause I can still use it for about an hour and a half then it shuts down without any warnings. SMH now it is stuck at 98% Smiley Sad It's been a year since I have it.

 

Former Employee
Posts: 1,664
Registered: ‎09-16-2014
Location: US
Views: 396
Message 10 of 11

Re: Lenovo Y40, false 100% charge.

In response to customer reports of unexpected battery gauge behavior on Y40-70 and Y40-80 laptops, Lenovo determined the battery gauge software is performing as expected. The unusual gauge results being reported are a reflection of the battery reaching end of life.

 

Lenovo has released a Service TIP to assist customers with obtaining battery replacements under warranty, or if out of warranty, to find a replacement battery from Lenovo-approved vendors. The Service TIP can be found here: https://support.lenovo.com/us/en/solutions/sf16-I0023

 

The part numbers for Y40-70/80 batteries are:

Y40 SP/A L13M4P01 7.4V48Wh 4cell bty (Y40-70/Y40-80) 121500248

Y40 LG L13L4P01 7.4V48Wh 4cell bty (Y40-70/Y40-80) 121500249 substitute part 121500251

Y40 CP/C L13C4P01 7.4V48Wh 4cell bty (Y40-70/Y40-80) 121500259 substitute part 121500251

 

To determine which battery came with your Y40 notebook, instructions for removing the bottom cover can be found in the Hardware Maintenance Manual pdf here. An alternative to opening your system (which does not void warranty) is to search for batteries using the model/product number located on the bottom cover.

 

Thank you,

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