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Considering this, is corrosion a sign of a bad battery?

Corrosion on the battery One of the most common symptoms of a battery terminal issue is visible corrosion. Since the terminals are in direct contact with the battery they are exposed to the acidic fumes from the battery acid and as a result are prone to developing corrosion.

Also Know, what causes batteries to corrode? Battery corrosion is caused by hydrogen gas being released from the sulfuric acid inside the battery. As the gasses react to the ambient atmosphere, it begins to produce a corrosive environment. If battery corrosion is present on the positive battery terminal, this is a symptom of overcharging.

Herein, why do batteries corrode in remote?

Editor: The most common cause of batteries leaking potassium hydroxide (which is actually an alkaline, not an acid) is simply leaving old batteries inside devices for too long. If you need to clean off the “battery acid”, be sure to wear protective gloves while doing so.

Can corrosion drain a car battery?

Without proper attention, your car's battery can corrode, possibly leaving you without a working car. Corrosion can drain power out of a battery and shorten its life. Battery corrosion is typically apparent at the terminals, a problem that can be resolved by careful cleaning.