This recall involves HTRC C240 battery chargers sold for charging lithium-ion batteries. The defective chargers are black with two blue screens, numbered 1 and 2, and the model identifier "C240 DUO" is printed between the screens. The brand name "HTRC" is printed at the bottom left corner.  All affected products can be identified by the serial number 6042201 and UPC  634383921487.