Longer Run Time & Battery Life - The PWRCore 20 Lithium Battery has an innovative temperature management system to keep the battery cool and powering on through your project Power Up 20V Tools - Pairs with any SKIL 20V product Always Know Charge Status - Green LEDs show status, so you always know how much charge is left Cooling material to keep the battery powering on for 25 percent longer run time Power up 20V tools pairs with any skil 20V tool Battery cell Li-ion fuel gauge