In the question below, a word is given, followed by four statements. From the options, choose the one that provides the combination of statements that can be joined using the given word, with minor changes to the original statement.

Which

1. When fabricated under controlled conditions, the amount of energy that can be drawn from the iron ion battery is 220 Wh per kg.
2. This is 55-60% of lithium-ion battery’s performance. 
3. The iron ion battery is cost-effective.
4. The amount of energy that can be stored in the battery is also high.