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.