Quote:
Originally Posted by theducks
Otoh, my 50year old (emergency use) flashlight still uses 2 @ standard size 'D' (I did upgrade the PR sized lamp to LED)
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The D cell used in Flashlights from about 1898 and the AA in "pen lights" for soldiers in 1914 (may have existed earlier). Though A, AA, B, C, D, E F and G designations were not official till maybe 1947.
B cells are still inside the 4.6V flattish battery with two long prongs. Used in old rear cycle lamps, flashlights and two side by side instead of the big 9V packs in European portable radios.
F cells are still inside most 996 6V packs with the two springs. The larger pack simply is two sets of f x F cells in parallel with screw fittings.
http://www.blaukatz.com/tables/basic-round-cells/
http://www.blaukatz.com/tables/other-batteries/
The largest ever 1.5V Zinc cell was the #8 or Flag used for car ignition (starting only on Magneto systems with crank starters), Home flag systems (bell push to servants), electrically powered pendulum clocks, Railway signalling etc. The 7.5V round Fencer uses 5 of the same size internally (IEC R40, but they are Zinc Air). Size 153mm tall and 63.5mm diameter.
Some old battery valve radio sets used 4, 8 or more D cells or F cells in parallel for the 1.5V filament, one pack used G cells but later D. Others used 7.5V, 9V or 12V by series connections of the valves/tubes. Before layer cells were invented all HT packs from 45V to 120V used multiple B cells. Mallory, now called Duracell, invented the button cell in the 1930s. The coin cell is based on the same concept. Originally mercury based, they are now Alkaline, Zinc Air, Silver (two kinds one rechargeable), and many kinds of Lithium (some rechargeable).