The following submission statement was provided by /u/DukeOfGeek:

So this is a big step forward for home/grid storage. Zinc is a safe, cheap widely available resource. We make pennies out of it.

Please reply to OP's comment here: https://old.reddit.com/r/Futurology/comments/y89aam/salient_energy_zincion_battery_passes_ul_safety/isypdqq/