Please describe "loose valve", not sure what you mean.
To fire automatically, you do, but the Vulcan can fire single-shot and does not need batteries to do so.
it doesn't, you have to have batteries
Yes. Sometime around 2005 - 2006, there was a widespread recall of laptop batteries, because they were catching fire.
If a stray wire or coin completes the circuit it will cause a short circuit where current is drawn from the battery at a high rate. This could cause heat and potentially a fire if flammable materials are nearby.
Batteries Not Included - After the Fire album - was created on 1982-03-19.
Recharging lithium CRxxxx batteries is not generally possible due to the chemistry and components used in these button batteries. In fact, recharging them can cause them to leak, become very hot, burst, or cause a fire. There are similar sized Lithium Ion and Lithium Polymer batteries that can be recharged, though they are rare.
Yes, the Nerf Vortex Lumitron can fire without batteries. The batteries are only used with the magazine to light up the discs as they are fired, so batteries aren't a necessary thing to fire the blaster.
Yes, it's not because of the material inside the battery, but to prevent the terminals from touching other batteries. If battery terminals touch they can create heat which, in turn, can cause a fire. So to prevent a fire, you should tape all battery terminals when shipping for recycling.
yes they do run out of power
Too much heat going into batteries, batteries are damaged, or batteries manufactured wrongly
No.