Thieves use lithium detectors to locate mobile phones and computers in cars

A small device — known as a lithium detector — now makes it possible to identify the presence and approximate location of batteries inside a vehicle, even when the devices are hidden. Media outlets such as El Mundo and ElCaso.cat say that the instrument works similarly to a metal detector, but detects the radiation associated with the lithium-ion batteries that power mobile phones, laptops and tablets.

Low-cost models — available for a few dozen euros — are enough for a thief to check from outside whether it is worth smashing a window and, if so, exactly where in the car the target is located. Scanners that pick up Bluetooth or Wi-Fi signals from active devices are also used.

Authorities and experts recommend never leaving devices in sight; switching off Bluetooth and, whenever possible, switching the device off completely or keeping it out of the vehicle. Staying cautious and keeping one's guard up can prevent a quick, targeted theft.