Dremel B20V20 - 20 Volt Max Rechargeable Lithium-Ion 2.0 Amp Hour Battery

Integrated Fuel Gauge: For fast and easy charge status For use with US20V Dremel Ultra-Saw and MM20V Dremel Oscillating Multi-Tool  Works with C20V20 Dremel charger Compact & Lightweight: Weighing only 0.75 lbs makes this battery the perfect size when powering your tool in any position Durable and conductive housing that protects the battery cells and helps keep the battery running cooler Cold Weather Operation: Battery will work down to -4F