How do you prove this to Apple? I have a 1year old MBA that is definitely not getting anywhere near 3 hours on battery, let alone the 7 they advertise.
The cycle count is in System Information, as is the age of the system. Their own docs say it should get 1000 cycles before you're down to 80% of the original capacity. They have diagnostic tools to test it at the Genius Bar and measure the actual full capacity of the battery.