1. Know the warning signs
Look for a case that bulges or splits, a battery or device that is hot to the touch, a hissing sound or a sharp smell, or a battery pack that no longer sits flat in its compartment.
2. Stop using it straight away
Take the battery out of the device, or unplug the charger. Don’t try to charge, squeeze, bend or puncture it.
3. Move it somewhere safe
Put it on a non-flammable surface, away from anything that burns and away from direct sun or heat. If it starts smoking or flames appear, leave the area and call your local emergency number.
4. Protect your skin and eyes
Wear gloves when you handle a leaking battery. If fluid touches your skin, rinse with plenty of water. If it gets in your eyes, rinse with clean water for 15 minutes and get medical help.
5. Dispose of it properly
Don’t put a damaged battery in the bin. Tape the terminals and ask your council or a local shop where to take it, usually a battery or hazardous-waste point.
6. Check the device too
A leak or swelling can damage the device. If the battery compartment is corroded or bent, don’t use the device until someone has checked it.