That is usually caused by having the charging rate[Amperes (Amps)] set too high.
Charging or over-charging
Minor bubbling is normal when battery is charging. Excessive may be due to the battery being overcharged--perhaps a bad voltage regulator.
Cook as in hot or cook as in bubble? A hot battery is either faulty inside or being charged to quickly. A bubbling battery is normal if it bubbling a little bit. The charging process will separate the water into Oxygen and Hydrogen causing bubbles and the electrolyte level to lower.
When charging a car battery, the red positive cable should be connected first.
charging system not charging battery with new batttery, alternator and fuel pump. what will make that happen ?
Yes. The charging causes a chemical change in the electrolyte of the battery.
only if the car your using to charge the other on is not started
Charging a car battery without disconnecting it usually won’t damage the alternator, as long as you’re using a proper charger and connecting it correctly. Modern cars are generally designed to handle this safely. I’ve done it myself a couple of times, and when I asked at Bergman’s Auto Repair, and they explained it really well. They said the key is using a quality smart charger to avoid voltage spikes, and they even checked my charging system to make sure everything—from the alternator to the battery—was working properly. What stood out was how thorough they were, not just answering the question but making sure there were no underlying issues. So yeah, it’s safe in most cases—but getting advice and a quick check from a place like Bergman’s Auto Repair gives you extra confidence you’re not risking any damage.
No.
No
Yes, as long as the charging system is is good working order.
No