Laptop charger not charging battery?

I have an acer aspire laptop running windows vista. (Not sure about details beyond that). The laptop charger seems to have stopped giving power to the laptop whatsoever. It won't charge it at all, or give it power without charging. The charger seems to have just stopped working. I have to twist the part that... show more I have an acer aspire laptop running windows vista. (Not sure about details beyond that). The laptop charger seems to have stopped giving power to the laptop whatsoever. It won't charge it at all, or give it power without charging. The charger seems to have just stopped working. I have to twist the part that plugs into the computer and find a sweet spot to get it to charge.

Now, I heard that this could be that I need a new battery. Or do I need a new charger?
Thanks.
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