What must you be cautious of when recharging lead-acid batteries?

When recharging lead-acid batteries, it is important to be cautious because they can explode. This risk primarily arises from the hydrogen gas that is generated during the charging process. If the battery is overcharged or charged improperly, the hydrogen can accumulate and create a potentially explosive environment. This is especially true if there are any sparks or open flames nearby, which can ignite the gas.

Proper ventilation during the charging process is crucial in preventing the buildup of hydrogen gas. Additionally, following the manufacturer’s guidelines for charging, including using the correct voltage and amperage, can help mitigate this danger. Understanding the risks associated with lead-acid battery charging is key to ensuring safety during the recharging process.