Question Macbook Pro 2012 wont start after installing new battery

Apr 22, 2020
My MacBook Pro shows the current battery with status 'service battery' so I ordered a new battery and installed it but the mac won't start with the new battery connected. The MagSafe shows an orange light as if the battery is charging and the fans run in a continuous cycle powering up for a second and then powering down. If I put the old battery back in, it runs fine. I've tried all the usual SMC etc resets to no avail. Any ideas?
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