1.
Plug in the power adapter and fully charge your PowerBook's battery until the light ring or LED on the power adapter plug changes to green and the onscreen meter in the menu bar indicates that the battery is fully charged.
In other words, charge the battery until it's full.2.
Allow the battery to rest in the fully charged state for at least two hours. You may use your computer during this time as long as the adapter is plugged in.
[...]
Thank you very much
Long story short, as soon as I get home I had to fully charge it without using it, charging it while using it or using it for a while and then charge it?