How Long to Charge a Black & Decker 7.2V Battery

Written by jon stefansson
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Many Black & Decker power tools use 7.2-volt rechargeable batteries for electricity instead of a direct connection to a power outlet. Battery packs reduce trip hazards and let you use the tool in locations without outlets. Charging your Black & Decker battery pack ensures your power tool is always ready for use. The amount of time the battery takes to charge depends on its age and the amount of use it has experienced during its lifetime.

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New Black & Decker 7.2-Volt Batteries

When you first unpack your battery, it will not have a charge. The battery takes approximately 16 hours to reach a charged and usable state from its factory condition. The LED light on the battery charger will indicate when the battery has reached full charge.

Used Black & Decker 7.2-Volt Batteries

Black & Decker 7.2-volt batteries with a certain amount of charge remaining take significantly less than 16 hours to charge, although the precise amount of time depends on the age of the battery. Older batteries hold less of a charge but need less time connected to a power supply. Newer batteries take more time to charge but last longer.

When to Charge

Charge your power tool's battery as soon as you notice a drop-off in power or find that tasks performed easily earlier have become difficult for the tool. Continuing to use the battery on a low charge damages the battery and increases the time it will require on the charger.

Optimum Charging Conditions

Black & Decker warns against charging batteries in conditions hotter than 40.6 degrees Celsius. Avoid rooms colder than 4.44C, too. You risk damaging the battery if you attempt a charge in extremely hot or cold conditions. Avoid leaving your battery on the charger more than two days; overall battery life reduces during prolonged charging sessions.

Additional Charging Information

The battery charger may hum or heat up slightly during charging -- this is normal. Disconnect the battery charger from the power supply if the battery becomes extremely hot to the touch or if you notice any other abnormal activity. Disconnect the power cord from the outlet before you remove the battery from the charger.

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