My laptop charger stopped charging for some sort of reason

1. How long have you had this problem.
2. What is the current charge level of the battery?
3. Does the laptop run on AC when the charger is plugged in? Or does it still run off battery?

A lot of newer laptops protect the battery by not charging it if it's above a certain percentage (usually 90% or 95%). If you plug in the charger at a lower percentage and leave it plugged in, it'll charge it to 100%. But if you unplug it just after it's reached that threshold percentage, and plug it in again, it won't resume charging. You have to deplete the battery below that threshold percentage before it'll charge again.

In the old days, the laptop would charge the battery to 100%, stop charging, the battery would self-discharge to 99% after about 15 minutes, and the laptop would charge it right back to 100%. This repeated charging from 99% to 100% is what killed the battery, and within a couple years the battery would only last 5 minutes. The newer charging algorithms try to avoid this by allowing the battery to drop to a lower percentage (usually takes a few days to self-discharge to that point) before it'll top off the battery again.
 
1. How long have you had this problem.
2. What is the current charge level of the battery?
3. Does the laptop run on AC when the charger is plugged in? Or does it still run off battery?

A lot of newer laptops protect the battery by not charging it if it's above a certain percentage (usually 90% or 95%). If you plug in the charger at a lower percentage and leave it plugged in, it'll charge it to 100%. But if you unplug it just after it's reached that threshold percentage, and plug it in again, it won't resume charging. You have to deplete the battery below that threshold percentage before it'll charge again.

In the old days, the laptop would charge the battery to 100%, stop charging, the battery would self-discharge to 99% after about 15 minutes, and the laptop would charge it right back to 100%. This repeated charging from 99% to 100% is what killed the battery, and within a couple years the battery would only last 5 minutes. The newer charging algorithms try to avoid this by allowing the battery to drop to a lower percentage (usually takes a few days to self-discharge to that point) before it'll top off the battery again.
 
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