12-06-2017 09:22 AM
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?
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12-06-2017 09:40 AM
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.
12-06-2017 06:32 PM - edited 12-06-2017 06:35 PM
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.
12-06-2017 10:21 PM
It does not automatically discharge