I bought the $20 repair kit to go along with the lithium ion battery. The suction cup and the heating tube did not work even after multiple attempts to use the heating tube. I had to resort to a hair dryer and use a straight razor to pry the edge just enough to slip a pick in there. I did find incredible use for the magnetized screw drivers and spudgers.
I bought the iFixIt lithium ion battery replacement and once reassembling the iPad Air 2 (double checking each connection for fit and order), it still does not turn on. ugh…