A bad battery can keep many units from turning on. It's intentional.
As noted above, unplug it from the power pack, remove the battery, leave it sit a bit, then plug it but leave the dead battery out.
Don't try to force a dead battery to work/charge. Even dead Li-Ion batteries are still potentially dangerous. If it's not charging then either the battery has failed or the system board has.
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
The Ogre's Fiero Cave (It's also at the top of every forum page...)