What does the acronym LCA mean in relation to battery cranking amps?
It stands for "Lithium Cranking Amperes": 



According to Battery University the CCA measuring method is prescribed by a Society of Automotive Engineers standard as so: 


  SAE J537 specifies that a battery with a CCA reading of 500A can
  deliver 500A at -18ºC (0ºF) for 30 seconds without dropping below 7.2
  volts


"LCA" is measured differently, and there may not be a standard for it yet. Some vendors list the amperes that can be supplied for a set period of time (15 or 30 seconds) without damage to the battery. You may have to contact the battery manufacturer to find the actual test conditions. Be sure to ask about temperature, if that's important to you. 

.