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A ZEBRA battery needs a minimum temperature to operate. That is because only then the ions move freely enough.

The electro-chemical reaction is as follows:

$$NiCl_2 + 2Na \longrightarrow Ni + 2NaCl + e$$

So what if I would cool a charged battery down to room temperature?

Since the one electrode will still consist of $NiCl_2$ there should be charge "frozen".

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