that last 1%

[smeowly]

i've noticed that for my previous blackbook and new alum macbook, the battery takes forever to charge from 99 to 100%. i just checked and it's been half an hour but still no change!

however, it takes only a few minutes to discharge it from 100 to 99%

does anyone know the reason for why it takes so long to complete the charge?

 

[Tosser]

i've noticed that for my previous blackbook and new alum macbook, the battery takes forever to charge from 99 to 100%. i just checked and it's been half an hour but still no change!

however, it takes only a few minutes to discharge it from 100 to 99%

does anyone know the reason for why it takes so long to complete the charge?

Trickle charging …

 

[Skeletal-dæmon]

Imagine you're pouring a glass of water and want it exactly full, not a tad under full and not so full that you spill even a single drop. Sure you start off filling it fast, but when you get closer to the top of the glass you slow down so as to not spill anything. When you get to the top you may even be adding water a trickle at a time.

That has by far got to be my best analogy of battery charging so far...

 

[Ron21]

Imagine you're pouring a glass of water and want it exactly full, not a tad under full and not so full that you spill even a single drop. Sure you start off filling it fast, but when you get closer to the top of the glass you slow down so as to not spill anything. When you get to the top you may even be adding water a trickle at a time.

That has by far got to be my best analogy of battery charging so far...

Yea that is a good one.. Might want to put it on Wikipedia or something..

 

[mrrish]

It's more to do with chemical equilibrium. The more and more reactants you have the harder it is to maintain it.