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.
On most modern sealed batteries you do not have to add water. On batteries that are not sealed you should check the battery monthly. If you have to add water only add distilled water and never tap water.
If your battery is not a sealed unit you add pure distilled water.
No, you should only add distilled water to an auto battery.
Add distilled water before for you charge it. Do not use tap water.
If you're talking about a car battery...maybe. If it is a maintenance-free battery than there is usually no way to add water to it. If it is not maintenance-free than it will usually have a way to add water, but the only type of water that should be added is pure, demineralized water.
If you can see the plates in the battery add distilled water to top it off.
Add Distilled water to the battery and then charge it fully with a battery charger. Do not add tap water.
No, you should not use rainwater. Use only distilled water.
Use distilled water. If the battery is a sealed battery you cannot add any water.
Unless it's a sealed battery, it's possible.But you shouldn't. it's distilled water you should use if and when it's needed.
Add nothing but distilled water to a battery.
It is unusual to add battery acid to a car. Cars (not hybrids) normally use lead acid batteries and the acid is sulfuric acid, however you don't add sulfuric acid. When the fluid in a cell is low you add distilled water. Only the water has evaporated, the acid has not.