Lights on Charges not coming on

I have now had 2 replacement charges for my MacBook and they have both stopped working after a week, is it the battery or am I just unlucky with the charges I have bought?

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You say you light on your charging is not coming but is the macbook turning on anyway? The cheap chinese knock off chargers are ridiculous if I had no charger in the middle of no where I would not it even use it to signal for help.

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