Good Article Efficiencyman,
Very interesting details. I am waiting for the perfect battery, the one that does not need complicated chips on the shoulder of each cell. The one that can take a 100% charge and deliver 99.99% in return

, Then we are in business,
Biff
Surely the "perfect" battery for home energy storage is one that last essentially forever?
It is the periodic battery replacement costs that dominate the cost of home energy storage, not the "efficiency". After all if the energy used to charge them is free (solar pv, wind etc) then losing a bit through the battery storage process is not disastrous is it?
As far as I can tel NiFe fits the definition of the perfect battery. I just wish someone would make them in sufficient quantity to bring the cost down.