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 you can see the plates in the battery add distilled water to top it off.
add water and charge the battery
Add Distilled water to the battery and then charge it fully with a battery charger. Do not add tap water.
No, if it is low of electrolyte just add distilled water.
You will shorten the life of the battery. Only add Distilled water to a battery.
If the battery has caps and is not sealed check the level of the electrolyte. If it is low add only distilled water.
No, you should only add distilled water to an auto battery.
No, just add distilled water if it is low of fluid.
No, if you have to add fluid to a battery you just add Distilled Water and nothing else. The Electrolyte in a battery is 65% distilled water and 35% sulfuric acid.
Maintenance free means just what the names implies. You will not need to add water to this battery ever.
Not necessarily. Just make sure to add distilled water and not tap water. I may last months or years longer.
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.