Why does a laptop say it’s at 6-8% charge, and then it dies, but when it’s at a higher charge, going from 60% to 59% takes a while?

Question

Why does a laptop say it’s at 6-8% charge, and then it dies, but when it’s at a higher charge, going from 60% to 59% takes a while?

In: Technology

Answer 1

Has to do with battery chemistry and the discharge curve of a Li-ion battery.

Voltage is all you can really read off the battery. The difference between 10 and 20% is a lot of volts, 30 and 60% very few volts, and then 90 and 100 is a lot of volts.

That’s why it drops from 100 -> 70-ish super fast, stays there for a while, then immediately tanks from 25 -> 0