Panasonic (formerly Sanyo) KR-1800 SCE .91x1.69, 47g/1.65oz Sub C Fits in screw-apart glow starters. Most popular choice for this application. Manufacturers listed internal resistance is 6.5mOhm.
Furkawa KR-1800SCE Specifications
Battery Cell Size: Sub C - Flat Top
Voltage: 1.2 Volts
Capacity: 1800 mAh
Termination Style: Flat Top (Non-Extending)
Size / Dimension: Diameter: 0.91" (22.9mm) x Height: 1.70" (43.0mm)