My battery life is draining so fast!

A

AC Question

I have a Samsung Galaxy s3, I've had it for about 2 years. So, the battery started going bad, I had got a replacement from a friends old phone he never used. So, now it can charge a bit, but the battery keeps going down fast. I have downloaded a few things, because it factory reset for some reason, not a big deal, and it's now 75% within about 45 minutes of use. It has an estimated hour, when I look at the battery in the settings(Airplane mode, brightness at 0%, etc.). I've assumed the battery I got from a friend was bad, or the phone just drains fast. So, I was going to get this battery, amazon.com/gp/product/B00GNSJU90/ref=ox_sc_act_title_2?ie=UTF8&psc=1&smid=A294P4X9EWVXLJ (I can't post links, so you'll have to copy&paste it)

I wasn't sure if it was a good idea or not, do I need to replace the battery, or is there something I can do to fix it?
 

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