Authenticity of camcorder batteries: How's the test carried out?

This might be slightly OT, but does anyone know what Samsung does to determine whether it's one of their own OEM batteries that's being used in their VPHMX10 camcorder - rather than a chinses-sourced lookalike? When the non-OEM battery is installed, the camcorder brings-up the message. "Check the authenticity of this battery". The battery is a three-terminal device - for a simgle 7.4V rail, so I guess there may be something very simple going on re the third terminal, but I don't know how the 'intelligence' is gained :-/

HYCH,

Cheers,

Pete.

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PeeVeeAh
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