"Rost" batterier är billiga

[Zalman3]

The Iron-Air battery is a 'new class of cost-effective, multi-day energy storage system,' that can feed electricity for 100 hours at 1/10th the cost of lithium-Ion, the 'holy grail' in terms of renewable energy technology.

https://www.dailymail.co.uk/sciencetech ... -days.html