It may be that part one (General) or part two (Physical and electrical specifications) of that standard defines the one to two digit code, and part 3 (Watch batteries) defines the three to four digit code. A subsequent version of that standard defined a three to four digit number that "correlate with the cell dimensions, being the diameter in millimetres (except for the extra half millimetre in some cases) followed by the height in tenths of a millimetre" making R44 now a R1154. For instance, R44 is an 11.6 mm diameter and 5.4 mm length.
Not having the various versions of that standard to confirm this, it appears that an earlier version of that standard defined a one or two digit number that corresponded to set dimensions. That 60086 standard seems to have evolved though several differently dated ones (and through more than one standards body), the more recent ones requiring that you pay money in order to obtain a copy. I do not have a copy of IEC60086 to hand, I hope that somebody who does can confirm or refute this. #Blu r1 hd battery drain 6pm everyday code
That is, the IEC size code for an "AA" battery (for example) is "R6" rather than "LR6" - the "L" meaning manganese-alkaline. in "LR6" etc is the chemistry type definition within the IEC standard, and not part of the cell size definition.
109 Height designation and IEC standard. 108 The most common battery size in Soviet/Russian electronic watches. 103 Lantern (Screw) battery image and IEC designation. 94 It would be extremely helpful if there were 2 more columns - for Amp Hour capacity and for internal resistance range. 89 A battery – Source of R23/LR23 designation for A-size battery?. 86 Combined 90v and 1.5v Valve Radio Batteries. 78 Diameter & height should be separate properties. 76 the capacities of 18650 bateries is out of date. 67 A new round lithium size is available. 65 Battery sizes or just some battery sizes?. 64 For a "so-called" LIST of well known battery sizes &/or model numbers. 57 Suspected error in "Round batteries", size C. 39 IEC designations for AAAA and internals of 9v. 37 You gotta pay up to the IEC to see the standards? what a joke. 28 hmmm "Table of modern primary battery sizes" ?. 
27.2 Split off uncommon batteries into new article?. 27.1 Merging article fragments into new headings?. 
27 Breaking up the mega-tables - a bold edit. 25 Brain-deadening articles not required. 15 SR44 button battery naming notes are contradictory?. 14 History of Battery Sizes: Comment by a Wikipedia newbie. 12.7 More Simple + Image inserted into Comments. 12.1 Table width fix: two rows of data per battery. 10 Terminal Layout of Lantern Batteries. 9.11 Suspected error in "Table of modern battery sizes", size C. 9 About Battery Categories and Common Names. 8.4 Radio controlled equipment batteries. 1 Antiquity and Standards (was: Antiquity).
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