I just purchased my first notebook from BenQ for school work. I have several questions to ask.

1) When I brought my notebook, the sales person said that the battery must be charged for up to 8 to 10 hours for the first time, is this really necessary? The battery already have power in it.

2) He also said that the battery should not be overcharged. How can I avoid overcharging it? Does it mean that when I use my notebook on AC supply, I must take out the battery to prevent overcharging it?

3) Is it necessary that the battery should reach 0% before re-charging it?

Thanks for any reply.