Draco's Smart batteries have built-in systems to prevent you from overcharging your LiPO as well as discharge protection to try and stop you from undervolting the battery cells and causing damage. If you have noticed your Draco battery has expanded or "Puffed" after flight, please leave it to cool down and ensure you do not attempt to fly with that battery or re-charge it. Whilst the battery is is warm, ensure it is attended at all times.
Once the battery has sufficiently cooled down, it should have reverted to it's normal size. If the Battery does not return to normal size, please raise a support ticket ensuring you provide as much information as possible.