Your Guide to Choosing a Long Lasting Watch Battery

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Your Guide to Choosing a Long Lasting Watch Battery

Choosing a long lasting watch battery is straightforward, if the watch owner has the original battery in his or her possession. If not, watch owners may have to visit a jeweller, since jewellers define watch batteries by a set of codes and standards. With some knowledge of these codes and standards, owners can easily select a long lasting watch battery.

 

The Meaning of Long Lasting

Men's and ladies' watch battery manufacturers define longevity in terms of milliamp hours (mAh). The figure provides jewellers with an idea of the amount of current supplied and for how long the designated current feeds the watch. A battery that possesses capacity of 40 mAh can supply 40 milliamps for an hour or 30 milliamps over two hours. Another factor that influences watch battery longevity is the storage temperature. A silver oxide battery stored at 21 degrees Celsius can expect to lose about 10 per cent power each year. The power loss rate diminishes in conjunction with a temperature decrease.

 

Battery Chemistry

Watch battery buyers can decide amongst three primary types of battery chemistry. Lithium batteries are three-volt cells, while silver oxide and alkaline batteries are 1.5-volt cells. Alkaline loses power at the same rate as silver oxide watch batteries, under similar storage conditions.. However, lithium batteries lose power at a decreased rate of 2 per cent each year. The voltage required to power a watch battery determines whether the user must purchase a battery that operates on lithium chemistry. Lithium cell batteries appear as the larger size button cell batteries.

 

Reference Number Prefixes

Consumers can find watch batteries to power their fine jewellery when they know the reference number prefix that associates a group of letters with each type of battery chemistry. The prefixes vary amongst chemistry types, depending on the name of the watch battery manufacturer.

 

Reference Number Prefix

Battery Chemistry

CR or BR

Lithium

L or AG

Alkaline

SR

Silver Oxide

LR

Alkaline

SG

Silver Oxide

 

Watch battery prefixes have relevance, since the prefixes represent the first bit of information that helps jewellers determine the correct battery size. After the prefix is a set of numbers that define the battery size.

 

Battery Size

Although chemistry plays an important role in determining the right long lasting watch battery to purchase, size is just as important. The chemistry does not matter if the battery does not fit within the watch casing. Lithium, alkaline, and silver oxide battery sizes typically start with two digits that define the diameter in millimetres. The next two digits represent the thickness of the battery in 0.10 millimetre increments. Jewellers determine which of the three chemistry types by referring to the two letters that sit at the front of the size information. For example, a Sony SR626 watch battery is a silver oxide watch battery that possesses a diameter of 6 millimetres and a thickness of 2.6 millimetres.

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