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little something about li-ion and li-po packs
First you dont need any permit to build a pack, because they still are under "experimental" stage. You don't ever have to be over 18 to buy some cells.
second there is only 2 ways of bursting a li-po or li-ion pack.
1-short it when there is some charge in it (a completly dead pack wont do anything) well duh any battrie will break this way....
2-charge it with anything else than a charger specially made for it, or over charge it (above 1 amp/hour)
these li-ion pack are not that bad, because they usually are made in the same hard container as any other battrie.., but li-po packs look like some small bags, made out off something like the ration metalic bags. they are easy to break, and they will short if it happens.
it won't go boom instanly, it will mostly inflate up to 2-3 times it size, and then leak a lot of instable material (acid and poisonous gaz) witch can cause fire. Be carefull though. If the pressure inside the cell is getting too high too fast (ie you short it really baddly when full charge) it might burst.
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