What Happens When A Battery Swells. This excess oxygen is part of what causes a battery swell. Generally speaking the risk of fire is relatively low while not being charged or discharged used and if caution is used to avoid handling which might cause the swollen casing to crack.
Swollen batteries while not common are a significant risk. From the outside a swollen battery can manifest as a hazy white screen due to pressure on the display. Charging a swollen battery is literally asking for it to turn into an exploding ball of noxious flammable gas right in your living room.
A swollen battery is a major inconvenience and a potential health hazard.
Metal oxidizes and when it does it creates a gaseous byproduct. Your battery not charging correctly holding charge or rapid discharge seems to be a major issue. Any damaged system components should be repaired or replaced in the process of replacing the swollen battery before resuming use of the system. That gas swells the sealed wrapper.
