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KKozlov
Fanfold Paper
Posts: 6
Registered: ‎01-26-2016
Location: Russia
Views: 311
Message 1 of 5

Lenovo y40-80 Performance on battery

Hello guys! I have a problem with performance on battery. When battery <40 %, my laptop starts to run too much slowly. When i open Resource Montor, i inspect that CPU max frequency is limitation by 32%. I try to play with battery plan option (put 100% CPU freq) in a differrent plans, but all is not affected.

Help please. It is too hard to browse web pages in this performance... But if i plug in power supply - CPU freq immediatly increase up to 120%.

 

Sr Support Specialist
Posts: 7,807
Registered: ‎11-30-2015
Location: PH
Views: 289
Message 2 of 5

Re: Lenovo y40-80 Performance on battery

Hi KKozlov  , 

 

Welcome to the Community Forums. 

 

Similar to erratic battery behavior was a released service tip here

Quoted from this thread :

 

"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 part121500251

Y40 CP/C L13C4P01 7.4V48Wh 4cell bty (Y40-70/Y40-80) 121500259 substitute part121500251

 

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 themodel/product number located on the bottom cover. "

 

You may call in technical support for recommendation informing the scenario and service tip.

7-499-705-6204, 7-495-240-8558 (Standard Charges Apply)  Russian
09:00 - 18:00 Monday - Friday (Moscow time)

 

Regards



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KKozlov
Fanfold Paper
Posts: 6
Registered: ‎01-26-2016
Location: Russia
Views: 287
Message 3 of 5

Re: Lenovo y40-80 Performance on battery

Thanks, but i dont have problems with jumping battery percentage and battery life. Battery work fine (3-4 hours) without jumping 30-0%. Discharging normally.

My question is - why below 40% battery, system automaticaly limit cpu freq. at 32% of maximum performance and how i can turn this "power safe" mode off ???!!!!

Sr Support Specialist
Posts: 7,807
Registered: ‎11-30-2015
Location: PH
Views: 278
Message 4 of 5

Re: Lenovo y40-80 Performance on battery

Hi KKozlov , 

 

As you have described trying the same scenario on different power options settings (high performance on both battery and AC connected) and same CPU usage , it doesn't to be erratic for now as I feel that it would be an initial event .

 

While you still have warranty coverage , I would suggest to have it checked by technical support as a probable emerging issue similar to this topics with different manifestations:

Y40 Shutdown notification/low battery notification

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

Y40-70 Battery Issues; Incorrect Reading, Sudden Shutdowns

Lenovo Y 40-80 Battery Full charge capacity is very low

 

Notice here on this post : Y40 hibernating without giving low battery notification  how the machine goes in hibernation as your CPU goes on power save mode as if not receiving needed power on lower battery range. Your machine maybe starting to have emerging symptoms and doesn't have to wait until the battery goes jumpy. 

 

It feels like another task calling in but in such event , best to use your warranty in your advantage. 

Update us how it would work best for you.

 

Regards

 

 



Did someone help you today? Press the star on the left to thank them with a Kudo!
If you find a post helpful and it answers your question, please mark it as an "Accepted Solution"! This will help the rest of the Community with similar issues identify the verified solution and benefit from it.

KKozlov
Fanfold Paper
Posts: 6
Registered: ‎01-26-2016
Location: Russia
Views: 258
Message 5 of 5

Re: Lenovo y40-80 Performance on battery

Thanks. Officially this model is not supported and dont have warranty in Russia. So i try to order and change battery by myself.

Tell me please, do i need a change firmware of battery controller?

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