Varta V540 battery pack, 4R25-2 (No. 540), 65F100/LR820 lantern battery, VARTA 4R25/2 zinc-carbon battery.
System: zinc-carbon battery, voltage: 6.0 volts, capacity: 19,000 mAh, connection type: 2 screw terminals, Varta type: V540, 65F100, dimensions (LxWxH): 134x71x125 mm, weight: 1179 g.