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to vent the Hydrogen gas that is produced when the battery is being charged.

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14y ago

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Why do filling caps for car batteries have small holes in them?

Ventilation. Auto batteries out-gas hydrogen under certain circumstances, and it must have a way to escape the battery case. "Holes in the caps" would be an older style battery. Today, most batteries have a flat, narrow tube along the top that fufills that function.


What is a car battery made of from outside?

charge batteries with caps in place.most U.S.A batteries are made with flame.


How do you charge 12 volt battery with caps on or off?

All lead acid batteries are always charged with the caps on. What this prevents is the acid accidentally boiling up an out of the cell and doing damage to surrounding equipment. When a car battery in a vehicle is charging when the engine is turning over, the caps remain on. This procedure should be no difference when the battery is on a plug in battery charger, the caps remain on. There are vent holes in the caps which allow any built up pressures to release.


Does water need to be added to car batteries?

If the battery has caps and is not sealed check the level of the electrolyte. If it is low add only distilled water.


Why can car batteries be recharged?

Car batteries are rechargeable storage batteries. They are designed to be constantly recharged.


What batteries work with a defibrillator?

car batteries


Are 6 Volt Car batteries AC or DC current?

DC definitely, all car batteries - all batteries.


Who manufactures Berkley Jensen car batteries?

BJ'S sells Excide car batteries.


What are rechargeable car batteries?

a car battery that can be recharged. All automobile batteries are rechargeable.


When should you add water to a car's battery?

You should check the battery water every few months. Take off the battery caps -- usually there are two of these caps with three cells below each. (You may need to slip a screwdriver blade under the edge to break them loose and get the removal started). Look into the holes. You will see some narrowing shelves about an inch or so down in the holes. Water should be level with the holes in these shelves. If not, add distilled water to bring the levels up to the shelf holes. Wash your hands after removing and replacing the caps, because they may have battery acid on them.


Batteries are car batteries ac or DC?

dc


Are car batteries universal?

Car batteries are almost as unique as any other part. No they are not universal.