Lithium-ion batteries produce gas while operating, so its container needs venting to prevent the battery from exploding. Lithium-ion batteries also produce heat, so the container must have a shutoff switch to prevent the battery from overheating.
Read more: How to Construct a Lithium-Ion Battery | eHow.com http://www.ehow.com/how_7637452_constru ... z1luJBXkZs