Batteries often die just when you need them most. But instead of throwing them away, there’s a simple and inexpensive trick using salt that can help bring some old batteries back to life.

How It Works

When a battery appears “dead,” it often still contains some charge, but crystals of corrosion or sulfation on the terminals can prevent proper current flow. Salt can help dissolve these deposits and restore conductivity, giving your battery a second chance.

What You Need

Old AA, AAA, C, or D batteries

Table salt (NaCl)

A small bowl

Warm water

A paper towel

Instructions

Prepare the Solution: