There was an articlein Model Avaition not to long ago where a guys van went up i flames as well as some damage to the pitts because he was charging a battery in the back of the van and they lit up.

I've been on OX at night for a year now, and I recently got a portable OX concentrator to take on plane trips. The kids are on the east coast and I'm on the west coast. This thing has two 14.4 v 6270Mah Li-ion batteries. They, the pair,are good for about 6 hours of use, but on a long flight, I would need something like six more to meet the requirements to allow me to board with it. It is kind of strange, as there is a limit on the amount of "ltthium" you can carry on board a plane. I think a trip to Australia would be testing one of these two conflictiing rules. Icharge this concentrator in motel room, actually run it off room power which charges it at the same time. I also run it off car power which also charges it. I expect that it is totaly safe. Ialso think that a lot of the Li-po blow ups are more related to either charger issues, or to damaged cells. Just a guess though.

Don