I would try verbally berating it in front of your other
batteries for the pathetic failure that it truly is. Then I would go out to the garage, grab a large framing hammer, and see if it will respond to physical
threats of violence. If you have exhausted both of these avenues to restore performance.......then I guess you'll have no choice but to contact C.S.
If the batt worked with the last carto...the post is fine. If the button depresses in and pops out to the normal position, then the button for all intensive purposes is fine. No LED, could mean the LED alone is not working but the battery is fully functional or it's simply another implication that the battery is completely dead.
What happens when you put it on the recharger?