If you are replacing a National GR927 battery in a Casio calculator please note that your calculator handbook is likely to say that Just take it to a jeweler and let them change it for you. They have all the tools, and it’ll only take them a couple of minutes. CR1025 is made by Panasonic and goes by a couple of different names: BR1025, P031 ND, and P031 and has no conversion that I know of.

This chart converts batteries and voltage (most are 1.5 or 1.35 Volts) for Everready, Energizer, Duracell, Maxell, Panasonic, and Varta. And converts battery cell numbers: 301, D301, SR43SW, SP301, V301, 303, D303, SR44SW, SP303, V303, 309, D309, SR754SW, WS6, V309, 313, D313, NP313, V313, 314, SR716W, 315, D315, SR716SW, V315, 317, D317, SR516SW, SP317, V317, 319, D319, SR527SW, SP319, V319, 321, D321, SR616SW, SP321, V321, 323, D323, WH-6, V323, 325, D325, WH-1, V325, 328<, 329, D329, SR731SW, V329, 333, SR610SW, 335, SR512SW, SP335, 337, SR416SW, SR416SW, 339, SR614SW, V339, 341, V341, 343, D343, NP343, V343, 344, D344, SR1136SW, WS12, V344, 350, D350, V350, 354, D354, V354, 357, D357, SR44W, SP357, V357, 361, D361, SR721W, SP361, V361, 362, D362, SR721SW, SP362, V362, 364, D364, SR621W, SP364, V364, 362, D362, SR721SW, SP362, V362, 365, SR1116W, 366, D366, SR1116SW, V366, 370, D370, SR920W, SP370, V370, 371, D371, SR920SW, SP371, V371, 372, SR916W, SP372, 373, D373, SR916SW, SP373, V373, 376, SR626W, SP376, 377, D377, SR626SW, SP377, V377, 379, D379, SR521SW, SP379, V379, 381, D381, SR1120SW, V381, 384, D384, SR41SW, SP384, V384, 386, D386, SR43W, SP386, V386, 387, D387, V387, 388, D388, V388, 389, D389, SR1130W, SP389, V389, 390, D390, SR1130SW, WS-10, V390, 391, D391, SR1120W, SP391, V391, 392, D392, SR41W, SP392, V392, 393, D393, SR754W, SP393, V393, 394, D394, SR936SW, V394, 395, D395, SR927SW, SP395, V395, 396, D396, SR726W, SP396, V396, 397, D397, SR726SW, SP397, V397, 399, D399, SR927W, SP399, and V399. the CR927 3V lithium battery. This mistake in the handbook appears across several different models of Casio solar calculators. The Watch Battery Cross Reference Table below gives all Watch Battery sizes and their equivalent replacement watch battery reference Note, that the lithium watch batteries, or button cells, are 3 volts, not 1.5 volts and cannot be substituted for a 1.5 volt silver oxide watch battery or alkaline or height). This will give you an idea of which watch battery to choose if you do not have a watch battery cross reference number to match the battery against.

Renata Watch Battery Swiss Made Batteries 379 SR521SW V379 D-379 618 Ja 280-59 Sb-Ac/Dc Sr63 Sr521 Silver Oxide 1.55V Coin Cell, with Long Expiry date

Lithiums are commonly used for calculators, remote control car starters and of course watches. Watches that use lithium batteries are normally the ones that have lots of functions and dials and buttons on them. Functions that use up a lot of juice.

Mercury watch batteries are no longer manufactured so your only alternative is to use a silver oxide watch battery of the same size. You should Button/coin cell batteries are a group of non-rechargeable batteries. Wristwatches are commonly powered using one or rarely two-button/coin cell batteries, and these batteries have limited operating lifetime. All batteries listed are battery chemical system “ silver-oxide” except for these few batteries listed: 313, 323, 325, 343, 354, 387, and 388. Those batteries are actually mercury batteries. This lithium battery conversion chart converts cells for Everready, Energizer, Duracell, Maxell, Panasonic, and Varta. They are all 3.0 voltage, and converts these battery cell numbers: CR1025, ECR1216, CR1216, ECR1220, DL1220, CR1220, ECR1225, ECR1616, CR1616, ECR1620, DL1620, CR1620, ECR2012, CR2012, ECR2016, DL2016, CR2016, ECR2025, DL2025, CR2025, ECR2032, DL2032, CR2032, ECR2320, CR2320, ECR2430, DL2430, and CR2430. this is a lithium battery. The handbook is wrong! The replacement for the National GR927 is the 399 silver oxide battery and notMake sure you get the proper battery for your watch. If not, have a jeweler do it for you. I always advise that anyway. People have a tendency of breaking their watch if they don’t know what they’re doing (crystals, crowns, gaskets, bands). It’s not worth the trouble. For further information about watch batteries; their chemistry, numbering, watch battery prefixes and