Charge it for a few hours after it says that it's 100% charged.
Then use it as a laptop (i.e., not plugged in all the time), and don't worry about when or when not to charge it.
Once every few months, do a full discharge (just use until it turns itself off) then charge, leaving for a few hours with no charge, then a few hours with 100% charge. This will help keep the battery level indicators correct.