New battery, detected normal and can charge but won't turn on

Hello guys,

I have a problem with my old macbook air. I have replaced the battery. on first month it runs ok. but suddenly my macbook air turned off when I unplug the charger. and now I can't turn it on with battery power, only with AC power. The battery itself can charge normally and detected ok on coconut battery. any suggestion what should I check?

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