[samste]

Common Sense and Caution as they should not just explode unless something is done to them. As Kieran Said they tend to flare or sizzle not explode but anything is possible.

We tend to really give Lipo's more grief when in our planes Flying from 0 amps up to 90 amps and they dont explode but they sometimes come down puffy.

Charging them is possibly the main time to be very cautious as this is when the lipo or charger can fail.
Never charge over the lipo stated c rating for charge and use safety and caution,

Storage -
A metal Tool Box is a great way of storing them as you can place them in and close the lid, you can line the inside with Cloth Tape so theres no possible shorting out of lipo to tool box.

Disposal -
You can plug a 12 volt halogen downlight to it and leave for several Hours to it goes Dead. Caution hear as well as Globe gets very very Hot.

Links -

http://forum.rcflyingclub.com/showthread.php?tid=13&pid=1882&highlight=lipo#pid1882
http://forum.rcflyingclub.com/showthread.php?tid=100&highlight=lipo

Steve