When You Should NOT Jump Start a Battery
There are situations where jump starting is not recommended and may even be unsafe:

Battery swelling or bloating. This indicates internal gas buildup, often caused by overheating or short circuits. Do not attempt to jump it.
Visible leaks. Acid leakage is a strong sign of internal failure and corrosion.
Rotten-egg smell. A sulfur-like odor signals hydrogen sulfide, which can be dangerous.
Severely old or corroded battery. A battery past its service life may be internally damaged.
Cracked or broken casing. Damage to the housing makes the battery unsafe to handle or charge.
If you notice any of these signs, do not attempt to jump start the battery. Instead, contact a professional or have the battery replaced immediately.
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