If a lithium-polymer (LiPo) battery is about to explode or is already swelling or showing signs of thermal runaway, handling it with extreme care is crucial. Here’s what you should do:

1. Do Not Throw It in Water:

• Water Reaction: Throwing a LiPo battery into water is not a recommended safety measure. Water can potentially cause a violent reaction with the battery, especially if it’s already compromised or if there are short circuits involved. The battery’s electrolyte and other components may react with water, potentially worsening the situation.

2. Immediate Actions:

• Move to a Safe Location: If you notice signs of swelling, heat, or smoke, carefully move the battery to a safe, non-flammable area. Ideally, this should be a place away from flammable materials and where the battery can be contained.
• Use a Non-Flammable Surface: Place the battery on a non-flammable surface like concrete or metal. If possible, use a fireproof container designed for batteries, but do not attempt to handle the battery directly if it’s emitting smoke or showing severe damage.

3. Containment and Disposal:

• Fireproof Bags: If you have a LiPo fireproof bag or container, place the battery in it. These bags are designed to contain potential fires and minimize damage.
• Contact Professionals: If the situation is severe, such as a significant fire risk, contact emergency services or local fire departments for assistance.

4. Handling Swelling Batteries:

• Avoid Puncturing: Do not puncture, press, or apply any force to a swollen battery, as this can cause it to burst or catch fire.
• Cool Down: If the battery is hot but not yet fully compromised, let it cool down in a safe area.

5. Prevention:

• Use Proper Chargers: Always use chargers designed specifically for LiPo batteries to prevent overcharging.
• Monitor Battery Condition: Regularly check the battery for any signs of swelling, leakage, or other damage.
• Follow Manufacturer Instructions: Adhere to the manufacturer’s guidelines for usage, charging, and storage.

Summary:

Throwing a LiPo battery into water is not a safe or effective way to deal with an impending explosion or fire. Instead, move the battery to a safe, non-flammable area, use fireproof containment if available, and seek professional help if necessary. Proper battery maintenance and handling can help prevent such issues from arising in the first place.