What I find happens most often with these
batteries is that at some point an atomizer/cartomizer/charger was put onto the battery too tightly. The positive contact in these
batteries "floats" and if over-tightened it is compressed, and will not make contact and because of this, will not fire.
Best bet is to get an eyeglass repair kit with the tiny screwdriver and work your way around the center connection pulling it up slightly. If your battery has an on/off feature, be sure to turn it off first. An incidental button press while a screwdriver is held against the positive and negative contacts could cause the battery to fail.
After you get the connection pulled up a bit, try again. If it works, you're all set. If not contact your supplier, there may be a problem with the battery.
If you do get it up and running again, remember DO NOT OVER-TIGHTEN! You're just making contact, not holding a bumper onto your car.