Hey everyone. I've got a Dimension 8300 desktop. It's about 5 years old. I got keep getting this message upon startup, along with 2 beeps in quick succession.

 

I'm guessing this is my motherboard battery running low, but I'm not quite sure what to do. Does it recharge? Do I have to replace it? If so, how? Is it worth doing or should I ditch the computer altogether?

 

Help me and I'll give you prizes.