Today only as part of its Gold Box Deals of the Day, Amazon offers a variety of Greenworks 40V yard tools, some of which have a USB backup battery port, at lowest ever prices. At 100/200Wh, these Greenworks batteries not only power the tools for a half hour and more, they can also be taken on the road as a huge battery backup for phones, tablets and even laptops. One battery will net dozens of full charges for devices like the iPhone which have a 12Wh battery for instance. Standout USB backup deals:

There’s also some outstanding deals on 40V battery items without the USB port.

Note, once you own a 40V Greenworks battery tool, there are 60+ tools that can be bought without a battery at much lower prices.

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