Why do I need to disconnect the battery after charging to power on

I just replaced the battery with an Ifixit kit. Followed the initial charging directions. After the laptop dies I can charge the battery (magsafe goes from orange to green.) After charging the machine will not power on. If I open the case and disconnect/reconnect the battery the machine powers on.

Thanks,

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This sounds like it could be an SMC issue. You can try resetting the SMC by following the steps here: How to reset the SMC of your Mac

It might also be helpful to confirm the health of your battery using an app like coconutBattery. You can find it here: CoconutBattery take a snapshot of the apps main window and post it here for us to see Adding images to an existing question

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