Battery formulation - IEC codes

The open circuit voltage and the capacity of battery depends on what its made of, i.e. its formulation. This table lists the various formulations and the IEC letter used to indicate them, as mention in the Batteries – button cell equivalents and Batteries – dry & alkaline international equivalents tables.

Letter code	Positive electrode	Electrolyte	Negative electrode	Nominal voltage	End-point voltage	Name
none	Manganese dioxide	Ammonium chloride, Zinc chloride	Zinc	1.5	1.725	Zinc-carbon battery
A	Oxygen	Ammonium chloride, Zinc chloride	Zinc	1.4	1.55	Zinc-air battery
B	Carbon monofluoride	Organic electrolyte	Lithium	3	3.7	Lithium battery
C	Manganese dioxide	Organic electrolyte	Lithium	3	3.7	Lithium battery
E	Thionyl chloride	Non-aqueous inorganic electrolyte	Lithium	3.6	3.9	Lithium battery
F	Iron disulphide	Organic electrolyte	Lithium	1.5	1.83	Lithium battery
G	Copper(II) oxide	Organic electrolyte	Lithium	1.5	2.3	Lithium battery
L	Manganese dioxide	Alkali metal hydroxide	Zinc	1.5	1.65	Alkaline battery
M withdrawn	Mercuric oxide	Alkali metal hydroxide	Zinc	1.35		Mercury battery
N withdrawn	Mercuric oxide, manganese dioxide	Alkali metal hydroxide	Zinc	1.4		Mercury battery
P	Oxygen	Alkali metal hydroxide	Zinc	1.4	1.68	Zinc-air battery
S	Silver oxide	Alkali metal hydroxide	Zinc	1.55	1.63	Silver-oxide battery
Z	Manganese dioxide, nickel oxyhydroxide	Alkali metal hydroxide	Zinc	1.5	1.78	Nickel oxyhydroxide battery