Prepare Salt Solution: Dissolve 1 teaspoon of salt in 2–3 tablespoons of warm water. Stir until fully dissolved.
Dip Battery Ends: Carefully dip the positive and negative ends of the battery into the salt solution for 1–2 minutes. Avoid submerging the entire battery.
Dry Thoroughly: Remove the battery and pat dry completely with a paper towel or cloth.
Test the Battery: Insert the battery into a device to check if it has regained some charge.
Reuse: If it works, continue using the battery until fully discharged.
Tips and Warnings
