Other manufacturers, like Rayovac, number their batteries without giving a clue as to the size of the watch battery, So a SR626SW is 6.8mm in diameter and 2.6mm thick givingĪ Rayovac equivalent battery, from the reference table, as a 377. Wherever you see a three or four digit reference number for a watch battery it is likely to follow the rule described above.įor example, a Sony SR626SW is a Silver oxide watch battery which has a diameter in the 6mm range and is 2.6mm thick.Īll watch batteries in the 6mm range have a diameter of 6.8mm. Other manufacturers use a similar reference numbering system for their watch batteries, and as a general rule Therefore, a L1154 is anĪlkaline button cell 11.6mm in diameter and 5.4mm thick.
Will show that all watch battery diameters in the 11mm range are 11.6 mm in diameter. The diameter in this case is in the 11mm range. Of the diameter and the second two again, as for the Lithium button cells, refers to the thickness in tenths of mms.
But in this case the first two digits refer to the range That this was 11mm in diameter and 5.4mm thick. Now having had this lesson, you will begin to see that other watch batteries also have a reference number There, told you that this was interesting!
So, for example, a CR2032 is a Lithium button cell which is 20mm in diameter and 3.2mm thick.Ī CR2430 is a Lithium button cell which is 24mm in diameter and 3.0mm thick. The first two digits refer to the diameter of the battery in mm and the second two digits give the height or thickness The Lithium button cell battery sizes are easy to determine from their reference numbers. And remember, you canĪlways use a Silver Oxide watch battery to replace an Alkaline watch battery. If not, and you can get the Alkaline equivalent then use that. So to summarise, if your application calls for a stable voltage under load (watches, clocks, metering equipment etc.) Jewellers, they have no problem in paying us for the more expensive Silver Oxide watch battery at a mere £1.50 each! Since some of our customers have been charged £4.00 for each LR41 by High Street In suggesting to owners of the Thunderbird Soundtech toys (which use 3 x LR41) that they can use the Silver OxideĮquivalent (Rayovac 392) instead. Rayovac do not make a LR41 so we have no problem There is no problem using a Silver Oxide watch battery of the equivalent size. Many electronic toys use LR44s or LR41s and Many of those children's noisy books use LR44s (Alkaline), but can runĮqually as well using the Silver Oxide equivalent (Rayovac 357). An Alkaline cell though is good for high current devices where a stable voltage is not required, for example, This characteristic makes them better for clocks and watchesĪnd absolutlely essential for metering equipment (like light meters in cameras for example) where a stable voltage is Where Silver Oxide cells score over their AlkalineĬounterpart is in their ability to maintain a more stable voltage. In fact Rayovac make only two Alkaline buttonĬell sizes but approximately 30 different Silver Oxide watch battery sizes. There is a much wider choice of Silver Oxide watch battery sizes. Just use the Alkaline watch battery of the correct size? Well, this depends on your application and if the Alkaline version isĪvailable. Well, firstly Silver Oxide watch batteries tend to be more expensive than an Alkaline cell of the same size. Since Silver Oxide and Alkaline watch batteries give the same voltage (1.5 Volts) then which battery do you choose? Tend to be the larger button cell batteries and their references tend to be prefixed with either CR or BR.įor example, a CR2032 is a Lithium battery. Therefore, the voltage of your application will dictate whether you will need a Lithium battery or not. The Lithium button cells will be 3 Volt cells (apart from the Renata 751 which is a 2V lithium battery) and the Silver Oxide and With respect to watch batteries there are 3 main types of chemistry, Silver Oxide, Alkaline or Lithium. (We know it's not that interesting, but it may help you order the correct battery!). We thought that you may find it useful for us to give you an insight into the interesting world of Watch Battery Cell Chemistry and Size Which Watch Battery do you need? The interesting world of Watch Batteries! All About Watch Batteries
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