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Because they are using more power then what they are using when they are out.

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14y ago

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Related Questions

Why does a car battery cook when charging?

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, which color goes on first?

When charging a car battery, the red positive cable should be connected first.


Why your car battery not charging back?

charging system not charging battery with new batttery, alternator and fuel pump. what will make that happen ?


Is charging of car battery chemical change?

Yes. The charging causes a chemical change in the electrolyte of the battery.


Can you drain a car battery by charging another car battery?

only if the car your using to charge the other on is not started


Do you need to unhook battery from car before charging?

No.


Is it safe to drive without a fan belt?

NO your car will run hot and seriously damage your motor, it will also keep from charging your battery. Suggest you take your car to a mechanic for repairs.


When idling is car battery charging?

Yes, as long as the charging system is is good working order.


Do you have to drain the car battery fully before charging it again?

No


What is the purpose of a cool down after charging a fork lift battery?

The battery is hot from charging and immediate heavy use may distort th internal plates.


Will trickle charging car battery through cigarette lighter hurt car computer?

no


Why is water added to storage cells of motorcycle and car?

The charging system may be over charging the battery. Over charging the battery can speed up the evaporation process. Have the electrical system tested.

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