Yup, Lithium Ion and especially Lithium Polymer batteries can be a touch tempramental. I had a 16S battery pack get punctured when I crashed my model helicopter a few years ago, and the flames were probably 20ft high and burned for a good 5 minutes. Helicopter was a write off.
Things to bear in mind based on my experiences and recieved wisdom of those I have talked with.
1. BUY A GOOD CHARGER. The cheap online ones and those provided with some devices are really not up to spec.
2. Check the battery for swelling or excess heat throughout the charging process. Either are an indicator of imminent failure. If you notice either, dispose of the battery.
3. Check for punctures. Even superficial looking dents can expose the interior of the cell to the atmosphere and when it is put under load...
4. Never leave them unattended whilst charging
5. Try and charge and store them in a non flammable box. If you use metal, make sure that it is lined with an electrical insulator
6. The batteries are usually specced for a certain number of cycles and will degrade over time. If its more than 3 or so years old, or has had heavy use, I'd seriously consider a replacement.
7. Check the leads off the pack. They often get nicked when inserting the battery, and if both get exposed they can short.
I should add that you shouldn't necessarily be put off using them, especially as nothing else can store nearly as much juice, but they are worth treating with a bit more respect than the average duracell.