You could if the battery was not sealed but what would be the reason for doing this? Electrolyte does not wear out.
You can buy battery acid at a dealer or auto parts store that sells batteries. However, YOU DO NOT WANT TO ADD ACID TO A DISCHARGED BATTERY. You only add acid to a pre-charged battery that has been drained for shipment. If the electrolyte is low, you add distilled water, and let the battery charge. Besides, if you are looking at a battery with a need for electrolyte, it is better to buy a new battery.
yes
Get a flashlight and look into the fill holes in the top of the battery. See those plates in there? Slowly add acid to each fill chamber until the acid barely covers the top of the plates. Go do something else for 5 minutes, and recheck the acid level. You will find it dropped a bit. Add more acid until the plates are barely covered. Put your fill caps on and place the battery on a battery charger. After this, you top the battery up to the top of the plates with DISTILLED WATER ONLY. There you go. Done.
Leaking from where on the battery, the caps? If so the charging system may be over charging the battery and causing the acid to boil out. Could be a voltage regulator problem.
buy a new one
battery iz dead add it in new battery.
Buy a new battery: that's a bad sign. just keep running it
You don't need acid to recharge the car battery. You may need to top it with distilled water and put the battery on the charger. You may be able to get the acid from a car battery shop, but some of the new car batteries now come as a sealed unit.
It means that the battery is junk and needs to be repalced. Time to buy a new one.
Car battery acid goes everywhere; acid can burn the hands if the person is not careful. A battery that is low on acid will not hold a charge as well. Most new car batteries have "cells" which hold the acids, so it's likely one cell is leaking.
Do "new" Vehicle Batteries Need to be Charged before useUsually not, especially if purchased from a battery shop, or auto parts store, or Walmart for example. They receive the batteries shipped in a "dry" condition [i.e., no electrolyte (acid or liquid) in them] and then they add the acid/liquid electrolyte, and the battery is instantly at full charge.On the other hand, if they [or you after buying] allow a battery to sit for a very long period of time, it's possible it will lose some of its charge.In any case, it will do no harm to charge a new battery overnight IF done at a trickle charge rate of one Amp, or two Amps maximum.
The acid weakens over time and the lead plates get covered with deposits left by the interaction of the acid and electrons flow and the lead plates.