: L 1570 (OTTO) Lithium iodide, trihydrate, 99% Cas 7790-22-9 - used as an electrolyte for high temperature batteries. L 1570 (OTTO) Lithium iodide, trihydrate, 99% Cas 7790-22-9 - used for long life batteries as required, for example, by artificial pacemakers. The solid is used as a phosphor for neutron detection.