NOVELTY - Mixture (A1) of organic solvents comprises at least one carbonate (1-99 wt.%); and poly(ethylene glycol) (1-99 wt.%).    USE - As mixture of organic solvents used as electrolytes for galvanic cells (claimed) e.g. lithium-ion cells, sodium-ion cells, lithium-air cells.    ADVANTAGE - The mixture of organic solvents, for galvanic cells and electrolytes for galvanic cells, can operate fully at extremely low temperatures, while maintaining correct operation at room temperature. The mixture of organic solvents solves the problem of low temperatures for galvanic cells, lowering the limit of the permissible application of a cell, as the electrolytes are liquid at very low temperatures (even below-100 degrees C). Moreover, the mixtures and electrolytes do not crystallize (they do not have a melting point) but only undergo a glass transition. Owing to this, even in the case of solidification, no crystalline domains form that may damage the cell, and the return to liquidity from the glass state is milder for the cell. There are no step changes in conductivity, changes in density and density inhomogeneity, which take place during the melting of crystals. There are no alternative mixtures or electrolytes having only a glass transition temperature as well as no electrolytes with such a low temperature of liquidity. Apart from the possibility to operate in extremely low temperatures (significantly lower than those for the battery mixtures known hitherto), the main advantage of these mixture consists in the fact that at low temperatures, crystallization does not occur (unheard-of earlier in the case of battery mixtures), but glass transition occurs, which is fully reversible and safe for the other cell components; also, no local salt agglomerates form (which may crystallize in the pores of the electrodes, destroying the latter), nor are there crystalline phases that might permanently damage the cell components or the entire cell (in the case of shorting of the electrodes or separator rupture, which may lead to the same consequence). Conductivity decreases gradually, without a sudden drop, as is the case for crystallization of ordinary electrolytes. Apart from their low-temperature properties, the mixtures are no more volatile than the electrolytes available hitherto operating at normal temperatures. The mixture does not introduce additional hazards for the cell (the majority of other cell components, e.g. some salts, have a decomposition temperature below 100 degrees C). The mixture can also be used in other applications requiring no crystallization at low temperatures and a liquid state down to low temperatures, e.g. a coolant. The solvents applied are commonly used in the battery industry (and other industries), and they are cheap (mass-produced). For production of the mixtures or electrolytes, no special manufacturing methods or equipment other than those already used are needed. No changes in existing process lines for cell production, studies of stability, compatibility with other components or tests of the components as regards their toxicity, teratogenicity, carcinogenicity and other risks posed by them are needed, as they are all studied and have been used in the industry for many years.    DETAILED DESCRIPTION - Mixture (A1) of organic solvents comprises at least one carbonate having formula (I) or (II) (1-99 wt.%); and poly(ethylene glycol) having formula (III) (1-99 wt.%).    R1-R4=H, F, 1-5C alkyl, 1-5C alkenyl or fluoroalkyl with at least one fluorine atom, including perfluoroalkyl (where the alkyl is 1-5C);    R5 and R6=H or 1-5C alkyl;    n=1-100, including non-integral values.    An INDEPENDENT CLAIM is included for an electrolytes for galvanic cells comprising mixture (A1) of organic solvents; and sodium and/or lithium salt (0.01-2 mole per 1 kg of the solvent mixture).