Battery still drains quickly after replacement - reset SMC - what now?

Fitted a new iFixit battery in a MacBook Air early 2014 and performance is worse that it was before - the whole thing drains from a full charge in under two hours. I’ve reset the SMC to no avail. At a loss as to where to go next… any clues?

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Lets get some diagnostics here. Install this gem of an app: CoconutBattery. Take a snapshot of the main window with and without the MagSafe plugged in, post both here for us to see. Adding images to an existing question

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