Was commonly used in small hand lanterns and bicycle headlights from 1950s to 1970s.
2R25?, 800, 900, No. 800, V800,
not to scale.
Length × Width × Height.
|Chemical Composition.||Nominal Voltage.|
Click for larger image
||70 mm × 35 mm × 100 mm|
Can be replaced by 2 F cells (see below) or a suitably modified 2 × C or 2 × D cell holder (depending on room in battery compartment).
If you are feeling really adventurous and you can find a brand of Lantern battery that is packed with 4 R25 cells or a couple of "F" cells, you could make an 800 by using a couple of cardboard tubes (the cells need to be insulated from each other) a couple of brass strips and a short piece of wire.