Standard Battery Sizes - Wikipedia
http://en.wikipedia.org/wiki/List_of_battery_sizesA "C" battery cell is 26 mm in diameter, BUT 50 mm in length.
http://en.wikipedia.org/wiki/C_batteryThere are 1/2, 3/5, and 2/3 sized "C" battery cells, some with Solder Tabs.
http://www.batterystore.com/Sanyo/N3000CR.htmYOUR SIZE, fits as a 3/5 "C" battery cell.
http://www.powerstream.com/Size.htmBattery Giant -- 3/5 C
3/5C-1100, Generic, NiCd, 3/5 C, 1.2v, 1100 mAh, Flat Top, 1 Pk
$5.90
https://www.batterygiant.com/Primary-Cells/showchem.asp?chem=NiCdhttp://www.interstatebatteries.com/cs_eStore/Products/RT/PID-NIC0203(Other+Products).aspx?dsNavigation=Ns~product+Type%7C101%7C1%7C%2CNrc~id-3%2CN~4294873218&Title=2.4V+1000mAh+NiCdDO YOU HAVE A SANYO BATTERY NUMBER ?
http://www.powerstream.com/NiB.htmThe Battery Store stocks Sanyo Ni-Cd batteries.
http://www.batterystore.com/Sanyo batteries was purchased by Panasonic.
The battery industry has quickly moved to Lithium and metal formulated cells.
Panasonic battery catalog
http://www.panasonic.com/industrial/includes/pdf/Panasonic-Battery-Energy_catalog.pdf