If it touches the tube in a cylinder mod it will ground and complete the circuit causing it to autofire.Shrink wraps can be fragile because they are so thin. The outer shell of a battery is part of the negative pole connection, so if it touches the cylinder in a tube mod it's not a problem unless there are contacts on a fire switch in that area (some mechanical mods). The bottom spring does exactly that, anyway. If it's in a box mod where it can touch other parts, it's an issue. The center contact is where you don't want unintentional grounding to occur.
I'd put some clear fingernail polish or clear tape on it just to prevent further rips.
Another option is to line the inside of your mod. Use a piece of playing card that is the full length of the mod and wraps once around the battery, I do this on all my mods.
Does that afford adequate room for any potential venting of the battery.
Relying on pressure to escape in that manner is a flawed practice.
Some heat does escape through those holes though. LoL
Relying on pressure to escape in that manner is a flawed practice.
How much when that battery swells just before it vents?