MacBook Pro dies quicker after Apple gave me a new charger?!

Hi all,
I was hoping I could get some assistance! I have a mid 2012 MacBook Pro. Last month, the cord on my charger broke. Apple gave me a new one (the half with the brick on it/the part that goes into my laptop). After I started using that charger, my laptop dies much quicker now (3-4 hours vs 7-8 usual hours). Is it because of the charger? Or does my laptop need a new battery? Any thoughts/opinions/suggestions? Please let me know! Thanks!

Are you taking your battery run time from the graphic in the menu bar or is that the actual run time?
Try a SMC reset:
http://support.apple.com/en-us/HT201295
If there is no change, run an Apple Hardware Test.  That may offer a clue:
http://support.apple.com/en-us/HT201257
Note that an error free AHT is not definitive.
Open Activity Monitor to ALL PROCESSES and look for any application that may be using a lot of CPU resources.
Ciao.

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