Installed new battery, now computer is extremely slow

Hello,
My battery was DEAD, and I just installed the new one today. (It isn't the one from apple, but Read reviews that this was good so I got it). But I installed the new battery today, and every since, my computer gets really slow and starts to lag a ton after 5 mins of starting up. I've never had this problem before. I tried the smc reset (not sure if it is actually resetting). I did a pram reset as well. I also have a lot of space. It is even slow and laggy when I am not running any programs. Once I start a video, for example on skype, or on youtube, it lags like crazy.
Please help me fix this.
Thank you!

Try having a technician install a battery made for your device.
Using things not made for your computer (or approved by the manufacturer) is a poor way to save money.
Barry

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