Wont do any harm to take the battery out,but it's debatable if it would make much difference to battery life,unless you are continuously running your laptop on AC power source.
I can confirm that leaving it plugged in 24/7 is not good for it lol I've had my laptop for about 3-4 years now generally always plugged in and it hasn't been able to survive a boot unplugged for the past 1.5 year, the battery just drains out before windows even loads completely.. Got a sony vaio btw.