Silly analogy. Three wheels on a car makes it undriveable. Ninety-five percent battery on a MBA, and it's still perfectly usable. I'd just keep the thing and move on with my life. It'll be fine.Do you use Coconut battery monitor? If not, I suggest everyone to use it to monitor battery status.
I would return anything if it's 95% left of the product. Would you be happy with 3 wheels car or watch skipping 1 second every minute? I don't think so.