Need help with macbook battery

[GamerMan101]

I have a MacBook, from about ~2008 early, according to About This Mac.The problem I need help with is the battery. It shows a black X on the battery icon.

When I unplug it, it turns off.
I have tried a new working Magsafe, no avail. I have also tried the current magsafe on another mac, and it works fine.

Thanks all. I would like to spend no money on a fix.
Thanks all again.

 

[sizzling]

By trying another known working battery and still getting the same problem means it has to be a laptop problem. I don't know enough about Mac's to help work out if it's software or hardware that is the cause

 

[BadAsAl]

Go into About This Mac > System Report > Power and look at the cycle count and battery condition. That will tell you what the Mac thinks the battery is doing.
Batteries are an issue a lot of times with older laptops and Mac's are no different. Sounds like your battery is worn out and needs to be replaced. You can easily replace it yourself. I would only buy an OEM Apple battery though as almost all the off brand one's I have tried didn't last more than a couple months. You can find them on Amazon or eBay just make sure you are ordering the correct one for your model. If you provide the model identifier, MacBook5,1 for example, I can tell you which one you need. This is in the About this Mac as well.