Laptop batteries

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This is really random even for the Random forum,but I have always wondered this:

If you use your laptop for three hours it takes three hours to charge to full,but in the first hour it charges 85 to 88%.

Then about another 7% in the second hour and then another full hour for the final 5% back to full.

Has anyone else noticed this and found it weird?

From my experience, it has this funny pattern be it brand new or frustratingly neglected batteries AND chargers.

Depending on the status of the two, it usually goes like this:
The 'quickest', depending on the charger, is somewhere in-between ranges around 10% to 90%, depending on the battery's usual duration. The lower the battery duration, the faster it charges as it drains, yet also relative to the charger's quality/compatibility.

It always gets slower in the end and towards 100%.
Indicators are not very accurate by itself, it might as well just estimate the battery charge. Though, the better state the battery quality, the more 'accurate'.



I'm no IT nor any tech, I just happened to had handled more than a couple of laptops for hours at the time.
I have no real in-depth technological knowledge nor have no real terms of physics for explaining it.

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