I need an advice for the following questions: 1. I already have an iTunes ID which I use for the iPad AppStore, backup....etc. I prefer to make another apple ID to be used with macbook, not the same as the iPad, I think if I used one id for both, things will be messed up. Is this ok? 2. Regarding the battery, for all windows laptops I used before, I usually use them with the power plugged in, and only use the battery when there is no power source, is this ok for mac or will harm the battery? Or should I keep charging and discharging the battery putting into consideration that it is not removable. 3. I want to fully test the macbook to make sure that the hardware is working properly, I believe it shall be obvious with the first few days of use, or shall I test it using a certain app.? Many thanks in advance for your kind help.