How to Clean Battery Acid Leakage

Protect your hands and face. The liquid leaking from a battery may contain corrosive chemicals that can irritate the skin, lungs, and eyes. Always wear rubber, nitrile, or latex gloves before handling a leaking battery or its leaked fluid. It’s also very important to wear safety goggles or a face shield when handling car or lithium batteries. Perform this process in a well-ventilated area and avoid directing airflow toward your face.

• If you experience a burning sensation in your eyes or on your skin, or if acid gets on your clothes, stop the cleaning process immediately, remove the contaminated clothing, and rinse the skin under warm running water for at least 30 minutes.
• Battery acid from car batteries is generally more hazardous than the fluid from alkaline batteries.

Place the battery in two plastic bags. For smaller batteries, use a clear plastic bag so you can identify the type of battery before proceeding. For car batteries and larger batteries, place them in two polyethylene bags with a thickness of 6mm or more. Seal the bags immediately by tying or taping the openings shut.

Identify the type of battery. Car and engine batteries are typically lead-acid batteries. Small batteries used in electronic devices come in a variety of types, so be sure to check the label for accurate identification. The most common small batteries include alkaline, lithium, Ni-Cd (nickel-cadmium), and lead-acid.

• It is not reliable to identify a battery by size and shape alone.

Guess the battery type based on voltage. If the only information available is the voltage (denoted by 'V'), you can make an educated guess based on practical knowledge: alkaline batteries typically have a voltage that is a multiple of 1.5V. Lithium batteries may have varying voltages, but they are usually labeled with multiples ranging from 3 to 3.7V. Ni-Cd batteries have a voltage that is a multiple of 1.2V, while lead-acid batteries usually have a voltage of around 2V.

Follow the instructions in the next section. Note that you should only follow the instructions for your specific battery type. Using the wrong chemicals to handle battery acid leakage can cause explosions.

• See the final part of the instructions below for how to dispose of batteries and clean the terminals.

Use baking soda to neutralize lead-acid or Ni-Cd acid leaks. These batteries can leak highly corrosive acid that damages clothing, carpets, or even metals. Always wear gloves and a face mask when handling such leaks, and apply plenty of baking soda onto the acid until the fizzing or bubbling stops. Clean the leaked solution with a thick paste of baking soda and water.

• Additionally, pour some baking soda into the bag containing the damaged battery.

Clean alkaline battery leaks with a mild household acid. For alkaline batteries, dip a cotton swab into vinegar or lemon juice, then gently dab to neutralize the leaked fluid. Use an old toothbrush dipped in the same mild acid solution to scrub away any dried battery acid. Avoid using too much water, as it can cause corrosion; simply dampen a cloth to wipe the acid clean. Repeat this process until the leak is fully cleaned, then let the device dry for a few hours.

Rinse lithium battery acid leaks with water. For lithium batteries commonly found in phones or round batteries, immediately place the leaking battery into a secure, sealed container to prevent the risk of fire or explosion. Any electrical device that comes into contact with battery acid is no longer safe to use. Dispose of the device and clean the acid using only water, without any additional substances.

Dispose of the battery properly. Alkaline batteries can be disposed of in regular trash, but most other batteries should be recycled. Visit the Vietnam Recycling page for more information on collecting and recycling electronic batteries in Ho Chi Minh City.

• Some battery manufacturers may offer trade-in programs where you can exchange old batteries for new ones for free or at a discounted price.

Clean the battery terminals (optional). If the battery leaked while installed in a device, the device's terminals should be cleaned for safe usage. Use a wooden or plastic tool to scrape off any leftover acid, then wipe the area with a slightly damp paper towel and dispose of it immediately. If the terminals are corroded, deformed, or discolored, you may need to sand or file them with metal tools, but keep in mind that they may still need to be replaced.