Windows 10: Why my battery's charging design capacity had decreased?

Hello there, My laptop has completed its 2 years and now its facing problems with the battery.Now, the battery has a much lower design capacity and decreases over time. I have another older hp laptop and I see that the design capacity does not decrease but the full charge capacity does. But in this case it is the other way around. The design capacity decreased from 38 925 mWh to 21 067 mWh. I have 189 cycles count in the battery.What can be the issue? Please help me to know about it.ThanksI'm sorry I can't include images, I think I have some impediment on the page, but it show thatCharge capac

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Battery full charge capacity decreased?





As you can probably see from the above image, my battery's full charge capacity has been decreased. Even though I just bought this laptop like 3 months ago, the laptops full charge capacity has been decreased by a huge amount like 5000mWh. I don't know what is causing this I have three questions...

i) What causes a battery to lose its Full Charge Capacity?

ii) Can a full charge capacity be increased (reversed) by using it the right way again?

iii) How can I save my battery from losing it's full charge capacity? Will using it plugged into the charger help it not get decreased?

 

Windows 10 battery percentage of design or full charge capacity?

Is the battery indicator in Windows 10 a percentage of the design capacity or the current full charge capacity of the battery ?

ie. if my battery capacity dropped from say, 60mWh to 30mWh from wear, would the indicator show 50% or 100% when the battery is fully charged at its current capacity of 30mWh ?

EDIT: to describe my case, I have an XPS 13 9350 whose battery has a design capacity of 56mWh. over the past few weeks, the battery percentage in windows stops at 55 with "plugged in not charging". running

shows that the current full charge capacity is about 41mWh, meaning at 55% I'm getting about 20mWh on a "full" charge. the surprising thing is Dell Command Power Manager shows my battery to be in excellent health.

 

Battery FULL CHARGE CAPACITY Reset

Yves,

"Full charge capacity" means the capacity that the battery is managing to achieve. It is not a limit set by Windows or anything else; it is merely a reading of what the battery can actually do. You can use the comparison of Full charge capacity with Design
capacity to decide when to buy a replacement battery [I do the same regularly].

Full charge capacity will always decrease over time as the battery wears out. This is a chemical phenomenon not a Windows-imposed characteristic.

Windows display of "Fully charged [100%]" means - the battery is currently at 100% of what it is able to achieve. In other words, "Fully charged [100%]" is relative to Full charge capacity.

Sometimes, you can find that cycling through the battery three times** can improve the Full charge capacity a bit.
On at least one of my batteries, the maker recommends doing this every three months. But doing so is using up even more of its remaining life so you can complete this procedure only to find that you are worse off afterwards.

** In other words, loop through this three times -

• remove the AC power
• use up the whole charge by using the computer
• recharge fully

Denis