A bulging battery is an indication the is a short INSIDE the battery and it is getting overheated, causing gas to expand inside. It could explode on you.
The battery has internal problems and/or the vehicle is overcharging and is probably giving off explosive fumes. Don't do anything to cause a spark anywhere near the battery and take it to a repair shop asap for diagnoses.
Yes it can
If you mean the battery is bulging or swelling then it may have been frozen. This will cause the electrolyte to freeze and bulge. A battery that is being or has been overcharged will also bulge or swell. A battery that is not secure and bounces around can have internal damage to the plates will can cause them to explode and bulge the battery. In any case I would immediately have your charging system tested at an auto parts store as your voltage regulator may be putting too much voltage into the battery. You should get a reading of 13.5 to 15.5 volts DC with the engine running at idle when you test at the battery posts. No matter what you find, replace this battery as it is dangerous and can explode at any time.
yes because it could be really dangerous without proper equipment
No, you should not use a battery that is bulging. It is very likely to leak, and could damage whatever you put it in. However, you should also not throw a bad battery in the trash. Check with your city or county, or a local hardware store, to find out how to dispose of batteries properly.
The bulging is caused by gassing. This is caused by overcharging or by a short circuit inside the battery. The acid inside the battery is turned to gas and it expands the sides of the battery.
Look at it. If the wire is corroded and/or the insulation is bulging, replace the cable.
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You can test your battery with a battery tester. If you don't have a battery tester, you could take the battery to Advance Auto Parts and they will test it for you for free.
You might have a pinched nerve, or something worse. I suggest going to the doctor.
Stared with bulging is when you stare at someone with bulging eyes.