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176 Posts

10-06-2008

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P51 Battery Charge Threshold

2017-12-06, 17:22 PM

My P51 battery is set to start charging when below 80% and stop charging at 95%.  (Lenovo Companion> Hardware Settings> Power> Battery Charge Threshold> Start Charging When Below 80%> Stop Charging at 95%).  I have my P51 plugged in all the time.  The battery always stays at 95% charged, it never reduces down to below 80% and then automatically recharges back up to 95%.  Obviously the P51 will run the battery down when unplugged and then when plugged back in it will recharge back up to 95% capacity and stay there.

My older T530 had the same settings as my new P51 does but it honors the charging perameters  set by the T530's Lenovo Companion's Charging Threshold....The battery charge gradually reduces to below 80% and then it automatically recharges back up to 95%...Thus "exercising the battery".                       My question is two fold...

1.  Why doesn't the P51 perform the same way that the T530 does using the same Charging Thresholds?

2.  Isn't it beneficial for a Lithium Battery to vary it's charge vs. staying charged always at the same level? 

Curious...

Altoid666

 

 

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P51, 1535M Xeon, 512GB SSD x2,64GB DDR4 ECC, Nvidia M2200M, Win 10 Pro v 2004, 4K IPS , Intel vPro, Sierra EM7455, WWAN, Model 20 HH.
T530,Core i7-3820QM,16GB Ram, Samsung 850 SSD 512 GB, Blutooth 4.0,Ultimate-N 6300, 15.6 FHD, Nvidia NVS 5400M., All software current.,Windows 10 Pro x64 , Office 2013 Professional
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01-02-2010

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Re: P51 Battery Charge Threshold

2017-12-06, 17:40 PM

My guess is that the power management works the same.  Probably, the T530's cells are slowly losing charge over time and when it gets below 80% it charges.  The new battery cells probably lose charge also, but MUCH more slowly.  When it gets below 80%, it will charge.  If you want to vary the charge level, unplug it for a few minutes, occasionally.  I think Lithium cells degrade over time, but I think the degredation speed has more to do with ambient temperature and number of recharge cycles.


Rich


I do not respond to requests for private, one-on-one help. Your questions should be posted in the appropriate forum where they may help others as well.

If a response answers your question, please mark it as the accepted solution.

I am not an employee or agent of Lenovo.
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176 Posts

10-06-2008

US

3408 Signins

18141 Page Views

  • Posts: 176
  • Registered: ‎10-06-2008
  • Location: US
  • Views: 18141
  • Message 3 of 4

Re: P51 Battery Charge Threshold

2017-12-07, 2:32 AM

RichK, thanks for your reply.  I really think that Lenovo's Power Manager is designed to automatically gradually reduce the bsattery charge from it's highest setting to a point where it automatically recharges back up to the maximum setting selected ie. 95% down to 80% and then back up to 95% thus extending the life of the battery.

Here is a thread from an earlier forum posting...https://support.lenovo.com/us/en/solutions/ht104070.  

You will notice in the begining paragraphs it indicates that the Power manager will automaticly charge, discharge and recharge the battery to the desired settings without any intervention from the user.

I feel that the current Power Manager Settings need an update to fix this issue.  As a point of information I have a brand new battery installed on my T530 and the power manager settings work as advertised.

P51, 1535M Xeon, 512GB SSD x2,64GB DDR4 ECC, Nvidia M2200M, Win 10 Pro v 2004, 4K IPS , Intel vPro, Sierra EM7455, WWAN, Model 20 HH.
T530,Core i7-3820QM,16GB Ram, Samsung 850 SSD 512 GB, Blutooth 4.0,Ultimate-N 6300, 15.6 FHD, Nvidia NVS 5400M., All software current.,Windows 10 Pro x64 , Office 2013 Professional
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11210 Posts

01-02-2010

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Re: P51 Battery Charge Threshold

2017-12-07, 6:21 AM

It does not automatically discharge


Rich


I do not respond to requests for private, one-on-one help. Your questions should be posted in the appropriate forum where they may help others as well.

If a response answers your question, please mark it as the accepted solution.

I am not an employee or agent of Lenovo.

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