Worx WA3012 20V Power Share PRO 4.0Ah Lithium-Ion High-Capacity Batteries were developed to unlock the full potential of Worx Nitro power and outdoor products, offering extended run times, more performance, and greater protection against heat and impacts than standard batteries. But they’re still compatible with every Worx Power Share 20V & 40V tool, outdoor power and lifestyle product. They feature an Intelligent Battery Management System (BMS) that monitors and optimizes each individual cell in the battery which maximizes overall performance, and cell-cooling technology employs thermoplastic material to keep the cells cooler, longer, which extends run time. The full-wrap 360-degree cell encasing provides protection against the tougher tasks that advanced DIY-ers and professionals put their tools through, with shielding against impacts, vibration, and excessive heat. And the charge-level indicator offers a constant readout of available charge for each Power Share PRO battery. These 4.0Ah models deliver 2X the capacity and up to 2X the run time of a standard 2.0Ah battery. Upgrade any of your Power Share products and get more from every charge.