Just realized that I brought the 45W MBA adapter instead of the 65W adapter for my 13" rMBP on a 10-day trip. I know it's bad for the battery to use a lower-wattage adapter. Just how much damage will I do in a week and a half? Are there certain charging patterns to adhere to or avoid that will mitigate it? Should I avoid using the computer at all once the initial charge runs down?