Battery life cut in half all of the sudden

The battery in my macbook pro would last about 4 and a half hours browsing the internet and watching some youtube videos. but oddly just this morning after i unplugged it, it only lasted about 2 and half hours. I hadnt done anything but browse a few websites and watch some youtube videos. i tried draining the battery, and then recharging, but it didnt work.
the battery has been running hotter than normal lately, so the fan has been running more often as well. i thought maybe the fan constantly running would be the reason for the battery life issue, but would the fans really cause my battery life to be cut in half? i didnt have this problem this past summer, when temperatures were in the 80s and 90s and my macbook was hot all the time, the battery would still last normally.
what should i do about this?

ive done that. no unusual programs are running. and about watching youtube videos. why would it last 4 hours yesterday, and now. while doing something like browsing a website, something that should consume less battery. it only last 2 hours?
Message was edited by: mrglass

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Thanks for that wjosten. Much appreciated.
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Battery life cut in half all of the sudden

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