Synergy Digital Power Tool Battery, Compatible with Festool BPS15.6 Power Tool, (Ni-MH, 15.6V, 2100mAh) Ultra High Capacity, Replacement for Festool 491 823, 492 269, 6S, BPS15, BPS15.6 Battery - Walmart.com
15.6V 3000mAh power tool battery for Festool Ni MH,Ni CD TDK 15.6 BPS15.6 T Nr 481710 D 73240 T Nr 492279|battery for|battery for toolsbatteries for power tools - AliExpress
Decidedly different: Cordless drills by Festool. - Festool Power Tools