There is a chance you have noticed a layer of powder-like power white deposits on battery terminals. This is corrosion caused by some specific chemical processes and can be a tell-tale sign of battery-related issues. The most benign cause may be poor engine-bay ventilation, which doesn’t allow evaporations from the battery to escape to the atmosphere. A leaking battery is much more dangerous, as the escaping acid is toxic and harmful. Still, you can always clean off these deposits using a toothbrush and baking soda and then monitor the situation to see what happens next.