Originally Posted By: Bill
The problem is that a simple lead acid battery is extremely difficult to scale up to the gigawatt scale. The charge and discharge rates are going to be tremendous.


That doesn't really make sense. If the discharge rate is too high, you can just add more batteries to reduce it. A lead acid battery can be charged or discharged in hours. So you could discharge them overnight easily enough.

I suspect the problem might just be the cost. That spongy lead probably isn't cheap, and then it only lasts a few hundred cycles.