I accidentally spilled some of the battery acid from my car's battery when I took it out from the car to fix something that was obscured by the battery. The battery got tipped over and I didnt notice, not until about half of the fluid spilled out. All the cells were affected.
I added water and recharged it, but now the cranking seems weak and the specific gravity is 1.20 instead of what it was before when fully charged, about 1.27.
I was thinking I'd just buy some sulphuric acid and add it until the specific gravity is back to normal.
Is this a good idea? Anybody ever tried this? The battery is good otherwise and only about 18 months old.