i bought new laptop (well not new, just one month old) i never unplug battery .... at home always use wall plug.

after 1 year battery life decrease from 3 hour to 2 hour (best stretch) now after 3 years can last maybe 30 minutes ... lol. (already bought new battery now can last 3 hours++)

my friend who practice unplug the battery after 3 years also same condition as me ... can last maybe a little bit longer around 45 minutes ...

so up to you lah