Danger Signs in Batteries
- Dry cell batteries, such as regular AA size batteries, can corrode over time, especially if they are left dormant in an electrical device. You can spot corrosion by looking at the terminals of the battery. If you see deposits that look similar to rust, you need to dispose of the battery. If you don't dispose of the battery the rust will eat into the metal, causing the chemicals inside the battery to leak. Battery chemicals are dangerous and can burn skin.
- Although today's dry cell batteries don't leak often, it can still happen. Leakage occurs if the seals between the casing and the terminals split or get damaged. You can tell a leaking battery as you will find a green substance forming on the terminals. Initially is appears wet but if left it corrodes the battery, and if the battery is in an electrical device it can damage it irreparably.
- Wet cell batteries are those that contain a fluid, such as a car battery. The casing is made from hard plastic and is relatively impact-proof, but if a battery is dropped or kept in temperatures below freezing for some time the outer casing can split. This can release the sulfuric acid inside the cells which will burn skin and clothing; if it gets in your eyes, it can blind you. If you see a crack or split in your battery you need to replace it, even if it doesn't appear to be leaking.
- It is usual for rechargeable batteries to get warm while charging. However, if a battery gets too hot it can catch fire or even explode. Never let your batteries charge longer than the charge time stated by the manufacturer. Regularly place your hand on the side of the battery and if it feels hot to the touch, turn off the charger and allow the battery to cool.
