From Antony Clarke When we need a battery to store electrical energy from an intermittent supply, the physical size of the battery is not the most important consideration (8 March, p 20). It is more important that it should not lose charge and should be cheap to build relative to the amount of energy it can store. The nickel-iron (NiFe) battery fell out of favour in motor vehicles because its size and capacity compared unfavourably to the lead-acid battery, but it could well come into its own for storing renewable energy. Its two main components are cheap and plentiful, and could easily be incorporated into the fabric of buildings. Kambah, ACT, Australia
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