Overcharging (bad voltage regulator) or a short circuit inside the battery.
Breather tube to allow gasses to escape from the battery
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It might explode. It will certainly send toxic gasses into the environment.
trap seal loss or poor venting
Exploding Automotive BatteriesAuto batteries are usually of the Lead-Acid type and thus generate explosive gasses [Hydrogen (H2) and sometimes Hydrogen-sulphide (H2S?)]. These gasses accumulate in the head-space in the battery, and are emitted from the battery at the vent openings. Any kind of spark which occurs inside the battery or in the explosive gas envelope outside but near the battery, can ignite the explosive gasses thus causing an explosion. Even a spark/explosion starting outside the battery can ignite the gasses inside the battery and cause the battery itself to explode.In your case, with only 3K miles on the battery [for all practical purposes a brand new battery] I suspect that an internal flaw/fault due to a manufacturing defect or defective materials led to/caused the ignition.All of this is based on the assumption that you, or no one else, tampered with, misused, or abused the battery during that 3K miles.Without an exhaustive examination/investigation of the remains of the battery it is not possible to determine the actual fault/flaw causing the failure.
Vehicular Battery Off-gassesYes, when a lead-acid battery is either charged or discharged it emits gasses [vapors]. Although there could be others, the primary gas is Hydrogen [H2], and sometimes Hydrogen Sulphide [H2S].If and when mixed in the proper ratio with the air, both of these gasses are highly explosive!!!!!
Smoke inhalation of gasses produced by the fire.
what causes the battery light to on a 2005 ford expedition to come on?
Sulfuric acid fumes escaping from the battery.
The battery for the battery backup is weak maybe
A few causes that will make the Battery Light come on are: 1. Faulty Battery 2. Loose Battery Connection 3. Battery is not Charging, ie. Faulty Alternator
Yes, a car battery can explode if jumped improperly. Car batteries contain sulfuric acid that can produce gasses. If a spark ignites the gases the battery can explode like a bomb.