Black & Decker tools that you use in and around the house often work on battery. If you need a new Black & Decker battery, consider which amperage best suits your job. The higher the amperage, the longer the battery lasts on one charge. At the same time, a battery becomes bigger and heavier as the amperage increases. Depending on your specific wishes, choose a Black and Decker battery that best suits this. In any case, make sure that the voltage is the same as that of the machine.