There is really nothing "perfect" about lead acid.
They let out fire-hazard gases when they charge.
You need to maintain their internal water levels.
They tend to spew acid on their surfaces.
Their voltage droops as you use them.
They can't tolerate deep discharge at all, and in general wear out quite quickly when heavily used.
They let out fire-hazard gases when they charge. You need to maintain their internal water levels. They tend to spew acid on their surfaces. Their voltage droops as you use them. They can't tolerate deep discharge at all, and in general wear out quite quickly when heavily used.
LiFePO4 is a huge improvement over lead acid.