Can I remove battery from laptop when have charger connected to laptop ?

Yes 🙂

Some airlines insist on it, which is how I know.

Regards

Paul

You don't need to if you if you take care of your battery correctly.

It is OK to leave your battery hooked to the charger most of the time. The only time I unhook mine from the charger is when I calibrate or for a few minutes to use in another room. You should calibrate every two months or so to keep the battery fully functioning. If you use your MacBook infrequently, it’s best to re-calibrate the battery at least once a month.

It is best not to use your battery unless you need to. Some people have hurt their batteries by charging then discharging every time they use the MacBook. This will age a battery very fast and cause you to buy a battery sooner than you should have too. Don't discharge the battery just because you used it. Li-Ion batteries prefer small charges over big ones. Use it and then plug it in as soon as you can. The only time my Battery is ever fully discharged is when I'm doing a calibration.

The following links have good information about the MacBook and the care of it's battery.

Apple: Tips for maximizing your Notebook battery charge

Apple MacBook and MacBook Pro: Reduces processor speed when battery is removed while operating from an A/C adaptor

Apple portable computer's battery does not show a full charge in Mac OS X

Look here and here for some good tips about battery care.

Apple MacBook: How to remove or install the battery

Apple: Determining Battery Cycle Count

Apple: Use and cleaning of MagSafe power connector

Provided you use your MacBook mostly on the charger, your battery will get little use. You can monitor your battery "cycles" in System Profiler. The cycles on the battery are generally a good gauge of how much use your battery has. You'll find that your cycle count will go up very slowly if you use your MacBook mostly plugged in (but as has been mentioned, it's a good idea to calibrate your battery every month or two). One thing to consider is that the performance of your MacBook will drop significantly if you run it with the battery removed. This is a safety feature. When you run your MacBook without the battery, the slightest power interruption will cause you to lose anything you may be working on. To help reduce the possibility of this happening, the MacBook drops it's processing power down to about half when operating on charger only with the battery removed.

The link I gave in my post describes the processor speed change. Besides not being needed this is the best reason not to remove the battery.

Yes you can, i do this because i use my macbook 2.4 as a desktop right now. I have spoke to four different people from apple. sales people to technicians as they all say it does not reduce the speed of the cpu and in no way does the battery have an inpack on the cpu speed or preformance. the only reason they would like you to keep the battery in is because or the power cord been knocked off and you would lose any-info you were working on at the time.

Hi Viseo: I believe someone has misinformed you. Read the Apple article below for details

http://docs.info.apple.com/article.html?artnum=305336

Stedman