The method that I used after the FLAPS guy couldn't figure out how to perform the free installation they advertised was to grab one post with vise grips and the other with a large pair of pliers.  As long as you don't let the two touch, its possible to lift the battery out.  Two vise grips would work even better.

Bill

> Of course, this also led to that issue of "skinning the knuckles" to
> get the old battery out.