I see some vendors sell battery acid for lead acid batteries, and that got me thinking and gave me a bit nuts idea. We change fluids on our cars on regular basis, what if we did the same on the battery too to prolong battery life? I mean the acid solution do deteriorate as well as other fluid on the car and it absorbs sludge from cells, i have seen sludge inside the cells inside older batteries. This gives me an idea. What if we pull away older battery from the car, pull the caps and drain it, rinse the cells clean with pure water, add new battery acid, recharge and then install back on the car. I mean, it could work in theory. Any one tried that before?