NiMH Panasonic EY9021 replacement battery by Amstron is designed for use in National and Panasonic power tools. This replacement power tool battery is compatible to National part number EZ9021 and Panasonic part number EY9021. Amstron brand power tool batteries are designed to be 100% manufacturer compatible and will meet original manufacturer specifications. • Chemistry: NiMH • Rating: 2.4V 3000mAh • LxWxH: 3.95'' x 1.52'' • Weight: 0.31 lbs. • Color: Grey • • Warranty: 1 Year