Yes indeedy! Button Lithium CR2032
It does suprise me though that the battery has already gone! the Pro version of the K7S5A hasn't been out that long, 12/14months? and usually these batteries are good for 2/4 years, guess you might have a cheapo dud.
These batteries usually just pop out, push back the spring clip one side and get your fingernail in there to prize it out.
Follow Freestone's good advice above.
Martin
Replying helps further our knowledge, without comment leaves us wondering.