Do I need to keep the battery in all the time or can I use on mains only

Hi, Does anyone know if it's ok to leave the battery out and use my mbp with the magsafe power adapter only. I mean will it harm the computer doing this. The reason I ask is I rarely use my mbp away from my desk I don't use it on battery power much and with the battery in I've noticed it's gets hot.
Thanks in advance

There is something else to consider. Your processor speed will be reduced and you are much more at risk of losing data should the power go out unexpectedly:
http://support.apple.com/kb/HT2332?viewlocale=en_US
Apple's recommendation is that you not run without the battery.

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