It is in the trunk of the car, under the carpet on the right.
No, you must use a battery with a connection for the vent tube to route battery fumes out of the car as the battery is stored in the trunk.
If it is a sealed battery you do not open it. If it is not a sealed battery simple remove the caps.
The battery is a Mt-MX5. This is a Interstate battery part#. fits 1990-2008 Mazda Miata. Go to interstatebattiers.com to find a dealer near you.
Try the right hand side of the boot behind the behind the carpet covering the wing.
Yes if it is a sealed battery. Even if it is not sealed it may still be good. connect it to a battery charger and see if it will take a charge.
A sealed battery, also known as a dry cell, cannot be refurbished. They can be recycled and should be disposed of correctly.
Yes.
You don't, it is a sealed battery.
Nothing. The battery is sealed an no harm will be done.
Yes, but it is not as safe as a sealed battery.
Use distilled water. If the battery is a sealed battery you cannot add any water.