I have a late 2011 Macbook Air model and the charger to it had broke. I tried out a charger from canada computers before buying and it did not work. I panicked and thought there was something wrong with my computer (I'm not very tech savvy).
I brought it to Elitetek before work and when I returned from work, he let me know the computer was ok but strongly recommended that the battery is replaced and obviously, that I need a new charger. So I bought the charger from the store (not authentic apple product, but it was cheaper and it works). After a week of thought, I decided to get it replaced and for the last few months, the computer has been working like new! It used to run on half an hour of battery but it's more like 2-3 hours now.
I'm really happy with the service and result! I think I can use this computer for another few years.