Hiya jc. Available options for battery colors appear in the drop-down box on the website at each battery description. (If they are out of a certain color, that color does not appear in the box).
Currently there is no way to know for sure what LED options exist/are in stock for each battery/color, BUT we are earnestly hoping the new website will feature a similar drop-down box for LEDs when ordering a battery.
In the meantime, you can request a particular LED color (best give them a 1st and 2nd option) in the "Comments" section of the Order page. They do their best to accommodate those requests. Non-Diamond series battery LEDs seem to come in blue, green, pink, purple, yellow, and red; Diamond series batts come in limited options including white and tone-on-tone (i.e., green battery with green LED.)