Battery controller- charge/discharge mechanism

slnacer

Model: E5-575-50RM

Qns:

. I see "energy by design" is 41.44 Wh and "energy when fully charged" is 35Wh i.e capacity is only 85% and this is a reasonably new (8-10months with light usage so far)laptop+internal battery. So does battery controller inside Lithium battery or Acer mobo controls charging automatically to not fully charge by stopping around 85% ?

If so I am happy or is it simply battery losing its capacity due to aging...

Sharanji

slnacer 
This is tp prevent wear and maintain battery longevity.  As a battery gets older, it loses capacity. If the battery's capacity when new was 4000 mAh, and its current capacity is only 3600 mAh (90% of new), then it has a battery wear level of 10%.

That said, battery wear is mostly caused by deep charge cycles. That is, charging to 100% and discharging to 0%. Shallow cycles (say, charging to 70% and discharging to 30% put almost no wear on the battery.

Newer laptops are programmed not to fully charge nor discharge the battery in order to prevent wear and maintain battery longevity. One of the ways I've seen some devices do this is by "faking out" Windows into thinking the battery has more wear than it really does. So the battery may be 4000 mAh when new, but the battery tells Windows it has 10% wear. This prevents Windows from charging it past 90%, thus preventing a deep cycle.

This is just one of the wear-prevention strategies out there, and I don't know if your laptop model is using it. So it could just be reporting a fake wear level to Windows. OTOH if the original owner let the battery discharge completely and left it that way, it may have self-discharged past 0% enough to damage the battery and the reported wear level may be accurate.

The only true test will be to monitor the wear level over several months of use. If it holds steady between 15%-20%, then it's probably nothing to worry about. If it continues wearing quickly, then the battery may have been damaged by the previous owner. (Measuring battery capacity and wear level is a bit of a black art, as it requires extremely accurate measurements of voltage. Things like discharge rate and temperature can drastically change the results, so a +/- 3% change in wear level day-to-day is not unusual.)

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Sharanji

slnacer 
This is tp prevent wear and maintain battery longevity.  As a battery gets older, it loses capacity. If the battery's capacity when new was 4000 mAh, and its current capacity is only 3600 mAh (90% of new), then it has a battery wear level of 10%.

That said, battery wear is mostly caused by deep charge cycles. That is, charging to 100% and discharging to 0%. Shallow cycles (say, charging to 70% and discharging to 30% put almost no wear on the battery.

Newer laptops are programmed not to fully charge nor discharge the battery in order to prevent wear and maintain battery longevity. One of the ways I've seen some devices do this is by "faking out" Windows into thinking the battery has more wear than it really does. So the battery may be 4000 mAh when new, but the battery tells Windows it has 10% wear. This prevents Windows from charging it past 90%, thus preventing a deep cycle.

This is just one of the wear-prevention strategies out there, and I don't know if your laptop model is using it. So it could just be reporting a fake wear level to Windows. OTOH if the original owner let the battery discharge completely and left it that way, it may have self-discharged past 0% enough to damage the battery and the reported wear level may be accurate.

The only true test will be to monitor the wear level over several months of use. If it holds steady between 15%-20%, then it's probably nothing to worry about. If it continues wearing quickly, then the battery may have been damaged by the previous owner. (Measuring battery capacity and wear level is a bit of a black art, as it requires extremely accurate measurements of voltage. Things like discharge rate and temperature can drastically change the results, so a +/- 3% change in wear level day-to-day is not unusual.)

Hit 'Like' if you find the answer helpful!   
Click on 'Yes' if the comment answers your question!

slnacer

Thanks for detailed reply. By the way i use Linux OS and i don't know how it fares relatively to Windows OS in general .

I would watch for few more months and check this