I think it&#x27;s mostly about brand security.<p>If a battery works with the laptop, it&#x27;s guaranteed to be a tested compatible one. Quickly slapping up a counterfeit and selling it as a brand-name thing won&#x27;t work.<p>A battery ua a critical device, prone to fires or blasts if made improperly. One such incident would significantly tarnish the brand. Thus the over-reaction.<p>I wish there wad an open spec for certified batteries, to allow for third-party fixes and replacements, though.