I've cracked the code for some of the button cells ("batteries"). The designations CR2025, DL2025, etc. refer to the diameter and thickness of the cell. The first two digits are the diameter in millimeters and the last two digits are the thickness in tenths of a millimeter. So, CR2025 and DL2025 refer to a cell that is 20 mm in diameter and 2.5 mm thick. Likewise, CR2032, DL2032 and BR2032 refer to a cell that is 20 mm in diameter and 3.2 mm thick.
One of course should look at many factors when substituting cells for other than the one specified. Cell dimensions are important, but so are polarity (is the case + or - ?), voltage, current rating, chemistry, etc.
Don't just go by appearance and visual size comparison. I held a 2025 and a 2032 cell together and I think that an unalerted casual observer would not notice the difference. If you put a 2025 cell in a 2032 holder, poor electrical contact might be made -- or none at all. Vice versa, a 2032 might overload the spring contacts or crack the case in an application calling for a 2025.
Meanwhile, it was neat to discover yet another example of silent metrication in our lives.
Jim -- James R. Frysinger 632 Stony Point Mountain Road Doyle, TN 38559-3030 (C) 931.212.0267 (H) 931.657.3107 (F) 931.657.3108
