How to Charge a 9V Battery
Nine-volt batteries are usually found in compact devices that require a higher voltage than what compact batteries can deliver. Nine-volt batteries are expensive so it's good to try and reuse the battery by recharging it. There are different types of 9V batteries nickel metal hydride and nickel cadmium.
- Find out what type of 9V battery charger you need. You can buy a 9V battery charger from an electronic store or the Internet. Make sure you buy a charger that is compatible with a 9V battery that you have. A nickel metal hydride charger will not charge a lithium-based 9V battery.
- Put the 9V battery into the battery charger. Make sure the battery terminals are in the correct position. If you do not place the 9V battery in the correct position, it will not allow a charge to flow through the battery. Normally you will hear the battery click if it's place properly.
- Switch to battery charger on and look for any illuminating lights. These lights will tell you if the battery is charging and if the charge is complete. If there are no lights on the battery charger, look for some indication that the battery is charging.
- Turn off the battery charger once the charge is complete. Remove the 9V battery from the battery charger and place it back into the unit. The battery may feel warm because of his recent charge, allow the battery to cool down before placing it into the unit.
- Test the unit to make sure the charge completed successfully. If the battery did not charge successfully wait an few minutes before trying to recharge it. The most common error is placing the terminals in the wrong position.