Are theses Battery worth it?

[TygerX7]

Well I love my Android Gem Samsung, but I work a 12 hur shift, an regretabily, i dont have a Power Line in my job, so I was wondering if these Batteries are any good, i be happy if they give me 4 hours each.... of internet use and facebook at the same time and texting.

Ebay Batteries for Gem

 

[GamerCore]

I bought like 4 of these and they work fine. Not great but more than adequate