The LEGO Batman Movie key chains consists of 6 key chain sets. All sets were released in 2017. The current value of all sets in new/factory sealed condtion is $83.77.
Most valuable LEGO Key Chains / The LEGO Batman Movie set 853633 The Joker Key Chain - $22.50
Most owned Key Chains / The LEGO Batman Movie set5004928 Kiss Kiss Tuxedo Batman Key ChainThese key chains are based on The LEGO Batman Movie released in 2017 and consists of themed key chains from the movie's minifgures including Batman, The Joker, Robin and a few others.
LEGO has released a number of key chains sets over the years based on many popular themes, including licensed themes. Most feature a minifigure attached to a key chain, although some simply have a LEGO brick or another LEGO element.