Revive a Dead Battery Terminal
Don't let a battery terminal's bent spring or broken contact put an expensive piece of electronics out of commission, especially when a little bit of middle-school mechanics can save you a costly replacement.
Without a positive or negative terminal, a battery can't complete a simple circuit and your electronics won't be able to function. So if it's the battery terminal that is broken, all you need to do is find a suitable conductor to replace it. Thankfully, you've probably got a flexible conductor sitting in your kitchen cabinet -- aluminum foil. Tear off a small piece and fold it up into a square that will fit into the gap left by your missing battery contact. It should complete the circuit and bring your battery-operated electronics equipment back to life.