ViviCam 7122: Could I easily repair this camera? The batteries drain!

Hello everyone, do you think I could easily repair this camera? I bought it from a thrift store so I can't return it, but I only spent 4 bucks on it so it's not that big of a deal.

So the batteries drain after 30 mins of use, and I know that's crazy cause I should be getting a few hours of use out of this camera shouldn't I?

Please let me know if this is an easy fix or if I should just chuck this thing in the recycle bin.