20V 4.0 Ah high-capacity Pro battery with indicator

If you are always coming up short on power or runtime, the new PowerShare Pro battery delivers longer runtime, faster charging and outstanding performance. These batteries feature intelligent battery management and advanced cell protection for extra durability and an extended life span.

Dewalt Releases 20V 4.0Ah Battery and Upgrades Select Cordless Kits

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Power Share™ PRO batteries are the driving force behind the new Worx Nitro Series of power and outdoor products. They offer more performance, more run

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WORX WA3012 20V Power Share PRO 4.0Ah Lithium-Ion High-Capacity Battery, Black and Orange & WA3770 20V Li-ion Dual Port 2 Hour Charger - Yahoo Shopping