Reason 1. The battery can boil
A charger is connected to the battery terminals, which manages the power flow. If the battery is old, the charging process can be interrupted. When the charger delivers too much current, not all energy goes into charging. Water undergoes electrolysis, releasing hydrogen and oxygen bubbles that can accumulate inside the battery housing. This is often described as the battery boiling. The remedy is to reduce the charging current and ensure the charger is appropriate for the battery’s condition.
Overcharging a marginal battery creates heat and gas. A battery that is not in good condition may vent gases, and increased pressure can lead to damage. Monitoring the charging rate and using a charger with proper current limits is essential for safety.
Reason 2. Ignition by a spark
With time, chemical reactions inside the battery produce a buildup of byproducts on the terminals. The released hydrogen, when mixed with indoor air, forms flammable gas. A small spark can ignite that mixture, posing a serious risk to both the battery and the surrounding space. Regular inspection of terminals and using correct connectors can help prevent this hazard.
Reason 3. The fire hazard of the battery itself
Explosive gas released from the battery inside a home can create danger. Even a cigarette or a spark from the charger can ignite gas. Sulfuric acid can spread if a breach occurs, causing further damage. Movement of the battery during charging or static discharge from hands can trigger an explosion. If a battery shows signs of a strong oxide layer or swelling, it is prudent to replace it to avoid risk. Charging should be done in a well-ventilated area or a dedicated space such as a garage, away from living areas. A fire extinguisher should be readily available, and charging unattended overnight should be avoided.
To minimize risk, consider these practical steps:
- Regularly check the battery’s terminals for corrosion or buildup and clean them carefully if needed.
- Use a charger that matches the battery’s specifications and limit the current to recommended values.
- Charge in a ventilated area and away from flammable materials or living spaces.
- Keep a fire extinguisher rated for electrical fires within reach.
- Do not leave charging unattended for extended periods.
For further guidance, consult reliable safety resources and manufacturers’ instructions. When in doubt, replace an aging or damaged battery to avoid risk. This information is based on general safety guidelines and consumer advisories as of today [citation].
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Source: AIF