ChatGPT says:

A large battery carried into a lift is unlikely to catch fire simply because the doors close and it generates a magnetic field. Here’s why:

1. **Battery Construction and Safety**: Modern batteries, especially those used in consumer electronics, are designed with safety features to prevent fires. They include protective circuits and cases to handle normal conditions and minor mishandling.

2. **Magnetic Fields**: Batteries do not create significant magnetic fields under normal conditions. They primarily generate electrical energy. Any magnetic field from a battery would be extremely weak and not capable of affecting the lift or causing a fire.

3. **Causes of Battery Fires**: Battery fires typically occur due to physical damage, manufacturing defects, exposure to high temperatures, or internal short circuits. These scenarios are unlikely to be influenced by the lift environment itself.

4. **Lifts and Magnetic Fields**: Lifts operate with their own electrical systems, but these systems are designed to be safe and isolated from external influences like the presence of a battery.

For a battery to pose a fire hazard in a lift, there would need to be some form of mechanical damage, manufacturing defect, or exposure to extreme conditions. Simply being in a lift with closed doors does not typically meet these criteria.