If Bruce Schneier (writing in Beyond Fear) is right, Nokia have a rather subtle technique for ensuring that their original mobile phone batteries offer better performance and value than third-party replacements:

Nokia spends about a hundred times more money per phone on battery security than on communications security. The security system senses when a consumer uses a third-party battery and switches the phone into maximum power-consumption mode; the point is to ensure that consumers buy only Nokia batteries.

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