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Paper Tape
Posts: 1
Registered: ‎08-23-2015
Location: IL
Views: 1,409
Message 1 of 4

Battery Drain Lenovo y40-70

I'm assuming that this thread may not even receive any replies based on the times I've attempted to receive aid from any professional within the Lenovo community. I'll give it a shot anyways.


Hello, I've had my Lenovo y40-70 for a little over a year (so that means my warranty is expired--do not tell me to use my warranty to fix my issue). After updating to Windows 10, I've had extremely bad battery life. It would drop from 100% to a hibernating state within the hour. Previously, I've received acceptable battery performance with maybe about 3-4 hours of usage. I've tried updating all my drivers and playing around with battery settings etc. I've uninstalled the energy manager application and am unwilling to perform a gauge reset due to the potential negative effects it may have on the my system. Anyone have any idea on how to fix this issue besides rolling back to Windows 8.1?


Oh yeah, I've also tried calling Lenovo support but I was literally on the line for 2 hours listening to a song. Any help is appreciated. May have to end up getting a different laptop if this problem persists.

Paper Tape
Posts: 1
Registered: ‎04-21-2015
Location: Greenville
Views: 1,264
Message 2 of 4

Re: Battery Drain Lenovo y40-70

I have similar issues with my Y40.  Add to that a loss of notification when the battery is low, so the Y40 goes into Hibernate without warning.  Also the data displayed about the amount of charge remaining in the battery stays above 90% most the time while running on the battery, even after 90 minutes of use. Tried uninstalling and updating the Energy Manager. And have tried various adjustments to the power plans. Nothing has solved the problems of unpredictable and erratic battery life, or at least what the Y40 thinks the battery charge level is at.


Paper Tape
Posts: 1
Registered: ‎02-01-2016
Location: United States
Views: 928
Message 3 of 4

Re: Battery Drain Lenovo y40-70

I have same basic issue. It would say 100% charge and never change and then just die with no notification and/or warning. After a while of doing that it now says 0% and goes between saying it is charging and not charging but it never leaves 0%. If I unplug the charger the computer dies immediately. I even started it up in the BIOS and let the battery drain completely and then plugged it in for 30 min and then turned it on and it still won't charge.

Former Employee
Posts: 1,664
Registered: ‎09-16-2014
Location: US
Views: 546
Message 4 of 4

Re: Battery Drain Lenovo y40-70

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:


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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