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I spilled coffee on my mac. The battery still has a charge, but the mac doesnt detect a battery. Can i purchase a battery board without buying the whole battery?

You really can’t take the battery assembly apart to replace half of it! No one sells the discreet elements of the battery asswmbly. Take a deeper look as the battery images here MacBook Pro 13" Retina (Early 2015) Battery Time to replace the full assembly!