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Lenovo Y40 Battery wont charge.

2016-03-05, 0:30 AM

Hi guys, 


My battery is no longer going above three percent when plugged in. I have a lenovo y40, the warranty just expired last month, and lenovo is not really helping. I'm very frustrated. Everything was fine, until I turned my computer on this morning and realized it wasn't storing power. After reading around on the internet I determined a few things.


A) The battery itself is fine, I ran a battery report... and it shows a sudden drop from 97% to 0% to 2%, and then back to 100% in a matter of minutes.


Battery Log   < Click to see my log


B) I think the issue is primarily a software one, becuase when I disable microsoft ACPI Compliant Control Method Battery in device manager my computer still runs for hours at 0% without being plugged in.


Anyone else have this issue or know a solution? I'm a college student and I need this laptop to work on the fly for me. It's barely been over a year, and im already having issues.... someone help I can't afford a new lp!!!!



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Re: Lenovo Y40 Battery wont charge.

2016-10-11, 15:50 PM

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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