I have 18 battery cycles on my MBA. How can I tell if I have a good battery? Any guidelines or parameters? Charge Information: Charge Remaining (mAh): 5701 Fully Charged: No (87% per Activity Monitor as I write this) Charging: No Full Charge Capacity (mAh): 6818 Also, does Wifi go "off" when I close the MBA, or should I shut off manually to save power usage? I am novice and not sure if I am asking a stupid question. Thank you.