The 2012 Air is a nice and reliable Mac, still supported with latest OS release and in my opinion worth investing in a decent battery. One hour battery time doesn’t make any sense even for an average quality aftermarket battery, the timing reflects a faulty battery that sooner than later will probably stop working completely. You can download Coconut battery to get battery condition in a glance and post a screenshot for better evaluation if you care, but I believe that would probably confirm a replacement should be in order.
Please post your results so we can take a look.
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