Apple does not recommend leaving your portable plugged in all the time. An ideal use would be a commuter who uses her notebook on the train, then plugs it in at the office to charge.1. Don't use it as much.
2. Be on AC whenever possible.
3. Make more money so you don't care how often is replaced.
Leaving the battery dead overnight every month for a couple years is not very good for the battery. I've had good luck with batteries by rarely going under 20% and only charging to 100% when I forget to unplug my device.Generally I would not interrupt the recharge process and I would drain it fully and leave overnight and recharge fully once a month.
This i thought was a good way to treat the battery.