Bad battery connection?

[TLL0003]

I have a macbook that I bought in 2008. I replaced the battery and it works fine except if my computer gets bumped even a little bit, the computer turns off. Its like the battery has a bad connection. What could be the issue?

 

[jav6454]

Battery is very likely very weak and can't hold a charge.

 

[TLL0003]

No it works perfectly most of the time. Its a brand new battery and lasts a long time. Only becomes disconnected if it gets bumped

 

[jav6454]

Have you checked the contacts? Do you notice anything loose ?

 

[TLL0003]

There were some small screws around the battery compartment that were a little loose but I tightened them up. Everything else looked normal