New battery now macbook won't start up?!

Hi people! My MacBook Pro died last week, due to the mrs letting it run too low on power! This resulted in the battery being dead!!! I purchased a new one via eBay (a cheaper aftermarket one) I installed the battery and hit power on!! No response!! I have tried various methods to try to get the mac to turn on but nothing seems to work! If I take the battery out and put it back in then hit power on I get it to try to start up for about half a second but then it's just dead again?!? Any ideas??? Thanks guys

Welcome to the Apple Support Communities
You mustn't purchase a third-party battery, and in your case, it looks like it's damaged, so return it if you want and take your computer to an Apple Store or reseller to get an official battery

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New battery now macbook won't start up?!

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