They used lipo cells hidden inside the frame of the battery, the heat output of the batteries lit up on an inferred camera. https://www.schneier.com/blog/archi

They used lipo cells hidden inside the frame of the battery, the heat output of the batteries lit up on an inferred camera. https://www.schneier.com/blog/archives/2016/04/cheating_in_bic.html https://www.schneier.com/blog/archives/2016/04/cheating_in_b...