A closer look

Your sleek rechargeable battery is secretly a volatile chemical balloon waiting to ruin your day. When lithium-ion cells age or get damaged, the liquid electrolytes inside begin to break down, generating flammable gases. Because they are sealed tight to prevent air exposure, the casing violently bulges outward like a metallic blister. If punctured, that trapped pressurized gas aggressively reacts with oxygen to create a lovely chemical fire.