Can a tracker card battery explode? I tortured mine to find out - and took pictures - ZDNET

ZDNET reports on a hands-on test of credit-card-style Bluetooth tracker finder cards that contain lithium batteries, focusing on whether they can catch fire if crushed or bent. The article explains that the main risk is stored electrical energy, not the lithium metal itself. The testing described involved physically breaking and flexing cards until they were warm but not hot, with no smoke or flames observed; the author also notes that damaged cards produced heat without venting. The piece discusses typical battery specs—about 110–400 mAh at a nominal 3.7V—and estimates lithium quantities, but argues that thermal runaway relates to charge release after internal short circuits from bending or piercing.