just bought my first mac ever 2 days ago, it's the new MacBook Air 13". There are a couple of questions I would like to know about: Firstly, when my MBA is plugged into a charger and the battery charges to 100%, does it keep on charging the Mac or does it switch to AC power and stop charging? Secondly, if the answer to above is that it keeps on charging, then how often is it okay to charge my MBA? Thirdly, as this is my primary computer I use it a lot! like A LOT! but my work is mostly browsing the internet and writing notes and as per the work I do I think the battery isn't giving the time it should. The battery lasts for 3 hours under the normal usage as mentioned above. Is it normal or should I get it checked?