[phoneman08]

The batteries themselves do not explode. If shorted, they can vent rather violently. The danger is if the e-cig design doesn’t have adequate vent holes to allow the battery to flare (like a cell phone would) and not trap the pressure like a gun barrel.

Protection circuitry is a good safeguard but is not failure proof. Same goes for any device that uses lithium batteries but is relegated to a fire hazard rather than a projectile.

[Swordmaker]

The danger is if the e-cig design doesn’t have adequate vent holes to allow the battery to flare (like a cell phone would) and not trap the pressure like a gun barrel.

Protection circuitry is a good safeguard but is not failure proof. Same goes for any device that uses lithium batteries but is relegated to a fire hazard rather than a projectile.

Most high end phones are now water and dust resistant. No vents. They still do not explode. They may erupt into a conflagration, a fire.