There are three parts to your eGo e-cig system, all of which are required to charge it, and any of which may fail and/or cause fires. They're electrical devices. They can fail.
1. The battery
2. The charger
3. The supply
So what can go wrong?
Whilst I have made every effort to ensure that the information contained in this post is accurate, it is your responsibility to ensure that the equipment you use is safe, and is operating within its specifications. If in doubt, contact the manufacturers.