My Makita 3/8 drill from the mid 90's. Still using the original battery! Forgotten about in the bottom of a drawer for a decade. Charged it up and it's good to go.
Makita 18-Volt LXT Lithium-Ion Sub-Compact Brushless Cordless 3/8 in. Sq. Drive Impact Wrench (Tool Only)-XWT12ZB - The Home Depot