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Paper Tape
Posts: 2
Registered: ‎08-04-2016
Location: US
Views: 611
Message 1 of 4

Lenovo Y40-80 Battery depleted from 70%-90% to 0%.



At times, my battery would get stuck at 70-90% for a period of time while plugged in, then suddenly dropped to 0% when I removed the charger. Within minutes, it hibernates. When i plugged the charger in again, although onekey optimizer indicates the battery is charging, it get stuck at 1% for a period of time. It estimates a 12 hrs charging time. 


However, when I get lucky, the battery randomly rises from 0% to 100% within seconds, and I was able to use the laptop for 2 hrs. Yet, when I plugged the charger in, the same problem occurs. 


I have tried to uninstall ACPI-Compliant Control Method battery, but it doesn't solve the problem.


I always put my battery in conversative mode, and tries to keep my setting low (brightness, etc) to perseve my battery.


I only have this laptop for a bit more than a year and my warranty just expired for 2 months, which is really upsetting. This problem happens to the my last lenovo laptop that I owned for roughly a year (right after that warranty expired too), and it seems like lenovo product is very fragile and doesn't last more than a year. 



What's DOS?
Posts: 3
Registered: ‎07-27-2016
Location: US
Views: 599
Message 2 of 4

Re: Lenovo Y40-80 Battery depleted from 70%-90% to 0%.

A friend and I have the same laptop and are having the same issues. I posted a thread a couple weeks ago and the help I received was not helpful at all. Hopefully someone replies and gives you better assistance. It seems a lot of people with the Y40-80 are having battery issues. Good luck to you! 

Former Employee
Posts: 1,664
Registered: ‎09-16-2014
Location: US
Views: 498
Message 3 of 4

Re: Lenovo Y40-80 Battery depleted from 70%-90% to 0%.

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,

Serial Port
Posts: 18
Registered: ‎04-08-2017
Location: ID
Views: 246
Message 4 of 4

Re: Lenovo Y40-80 Battery depleted from 70%-90% to 0%.

i have same issue on my y40-80, tbh the original battery replacement is more expensive than the other brand that has similiar capacity (7.4V48Wh 4cell 6000mAh). Then, i try to replace the battery cell, using A*us laptop battery. It work, but it has false reading capacity, just 1.5Wh 192mAh and only last 10-15 minute.

I also try to calibrate the battery, update the acpi driver, but nothing happen.

I try another lipo cell from my powerbank(5500mAh cell) and the result is the same. And I think the broken one is not the battery cell, but the battery module(the circuit).

About the warranty, I've made a claim, but my battery was damaged when the laptop was 1 year 1 month, and the service center said it was not covered by the warranty.

Here i attach battery information.


20453.jpgusing lipo from another laptop battery5500mah pb.jpgusing lipo from powerbank

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