Does it mean that the battery has exploded?
I often see the white powdery stuff when I see "battery disposal" boxes in public areas
Electronic – the white powdery stuff that leaks out of a battery if I accidentally submerge it in water
batteries
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Best Answer
In the case of e.g. a lead acid battery the powder is probably lead/zinc/alimuinium sulphate. In an alkaline battery it might be potassium hydroxide.
With most batteries (e.g. batteries used in consumer products) it is usually a sign of failure (leakage) and the need to replace/dispose of it.
With e.g. a car lead acid battery I don't think this is always the case, sometimes it may just need some attention as small amount of corrosion on the terminals is often expected and can be dealt with.