I have the Suunto X-Lander since 2008 and...
I have the Suunto X-Lander since 2008 and just ran out of battery.Do I need To replace battery and lid or can I replace only the battery?
You should always change the o-ring when changing the battery, to ensure the best possible seal. A Suunto Vector Battery kit should be purchased (will work for the Xlander), which includes a battery, o-ring, and a battery lid.
The kit can be found here at Backcountry - http://www.backcountry.com/suunto-battery-kit-for-1st-gen.-vector-x-lander-altimax-advizor-yachtsman