and in a sealed environment, there wouldn't be enough oxygen to sustain a fire long enough (if one even started inside the ELT), that would burn through the enclosure.
LI -x batteries do NOT need Oxygen to continue to flame- the chemistry is such they generate thier OWN oxygen.
ELT batteries are NOT chargeable
ELT is not normally connected to Aircraft electrical system- note I said NORMALLY - but ' sneak" circuits due to poor grounding, flaky connections, crossed wires, etc ** could ** possibly exist. Battery protection diodes can fail for example internally, etc. LI-x fires can be like a cutting torch.
Model airplane LI-x batteries can and do catch fire if abused/shorted/etc but they ARE rechargeable.
