Have you tried using your laptop without it's battery?

I have never tried to use my laptop without the battery. i would be leary of destroying the computer's performance without the aid of the battery.

Laptop batteries are far more complicated things than the dry cells that you buy at the store. Li-Ion laptop batteries have built-in controller chips which prevent them from overcharging, as they can explode if overcharged. Damage to the battery from overcharging would only occur in the very unlikely event of a malfunction of the charging system. To protect the life of a battery, it should be removed and stored at about 40% charge if you normally use an external power source. Leaving a battery in a laptop while using an electrical outlet for long periods of time will keep the battery in a constant state of charging up and that will reduce the life cycle of the battery. Stored batteries should be re-installed every 3-4 weeks and allowed to fully discharge in the laptop by using the laptop without the external power source. Leaving a battery in storage for longer than this without using it could cause the battery to fully discharge as the circuitry of the battery itself consumes power. Once the battery has fully discharged without using the monitoring system which is built into the laptop, it may not be possible to recharge it at all because there then might not be enough power to run the protection system, even with the battery apparently on charge. This is a not infrequent problem with mobile phone batteries.

I have tried it already. I remove the battery and connect it only to the charger if I there is a download that I need to do overnight. It's much safer this way so that you cannot overcharge and destroy your battery.

I tried this once and my laptop would not turn on. I have to admit I never tried it again as I did not see the point. But maybe there is some truth here and I will check that out as you are right the charging and recharging while plugged in would seem to be a waste and loss of battery life.