Panasonic 4R25 (4F) 6V Lantern Battery description are :

6V spring terminal lantern battery
Order code: UG996 (6V 4R25 heavy duty -Zinc Carbon battery)
Order code: UG996AM (6V 4LR25 Alkaline battery)
Categories: 6V Heavy Duty battery with spring terminal
Capacity: 667 milliamperes @ 9ohm lord cut off at 2.6 V (on Zinc carbon)
Description: 6V Heavy Duty battery with spring terminal
Size: Length (L) 66.7 x Width (W) 66.7 x Height (H) 115 mm + 2
Weight 500g
Terminal: Coil spring
Application for
Torch light , Lantern