To prolong the battery life. Keeping the battery at 100% charge at all times can damage it over time.
ok cool thanks for letting me know. I just got through playing ww3 for like 15 or 20 minuts seemed to drain battery only 1% not bad. I think this is normal, what do you think? im using my 230w charger not the 180w which is garbage.
Perfectly normal. Mine goes down to around 95% at times, since I got it a year ago. Right now it's sitting at 96% (plugged in, not charging) and I just booted up.