Quote:
Originally Posted by RURC
If you severly damage them they can not only rupture (like nickle batteries) but also catch fire. 
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If you over-charge a NiMH cell they can go bang in a pretty cool way, I for one don't like to be near them when it happens tho. While were on the subject, if you stab yourself with a kitchen knife that can be pretty painful
Any thing can be dangerous if not used correctly, follow the instructions and you will be fine