Fast charging lithium batteries from my 20V Black and Decker trimmer is the only option compared to using the charger that came with the trimmer. I don't have to wait hours for one battery to charge and remember to turn on the other to start charging when using both batteries. 20 minutes to fully charge each battery and two are ready to go! If I need to do extra trimming after using both batteries, the first battery will charge when I'm done with the other battery. In my case it pays to do the trimming work efficiently, especially in an area where there is a lot of trimming work to be done.
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