Eating a lithium-polymer (LiPo) battery would be extremely dangerous and could lead to severe health consequences, potentially fatal. Here’s what could happen:

1. Chemical Burns: LiPo batteries contain harmful chemicals like lithium cobalt oxide and organic electrolytes. If the battery is punctured, these chemicals can cause severe chemical burns to the mouth, throat, and digestive system.
2. Toxicity: Ingesting the contents of the battery can lead to poisoning. The chemicals inside the battery are toxic and can cause damage to your organs, particularly the kidneys, liver, and nervous system.
3. Electrical Burns: If the battery is short-circuited inside your body, it could cause electrical burns, leading to severe internal injuries.
4. Gastrointestinal Blockage: The battery could cause a blockage in your digestive tract, which might require emergency surgery to remove.
5. Explosion Risk: LiPo batteries are prone to swelling, leaking, and even exploding if damaged. If the battery ruptures inside your body, it could cause internal explosions, leading to life-threatening injuries.
6. Immediate Medical Emergency: If someone ingests a LiPo battery, it is a medical emergency, and they should seek immediate medical attention. The risks of serious injury or death are very high.

Never attempt to ingest or allow anyone to ingest a battery of any kind. If accidental ingestion occurs, contact emergency services immediately.