Can I charge a 18 volt dewalt battery with a 18 volt black and decker charger?

No, you should not charge an 18-volt DeWalt battery with an 18-volt Black & Decker charger, as they use different battery chemistry and charging protocols. Using the wrong charger can lead to improper charging, potential damage to the battery, or even safety hazards. It's best to use the charger specifically designed for your battery brand to ensure safe and effective charging.