Watch battery life

At present, there are usually three kinds of batteries for quartz watches, one is alkaline battery (LR), one is silver oxide battery (SR), and the other is lithium battery (CR or LI). Among them, the most commonly used quartz watch is a silver oxide battery, which has the characteristics of small volume, large capacity and stable discharge. In other words, a battery made of silver oxide does not gradually drop in voltage as it is used, as in a conventional dry battery. There are many model specifications for silver oxide batteries, among which are made in Japan. The brands are Panasonic, Sony, Wansheng, Seiko, etc. The Swiss product is called “RENATA”, and its battery is packaged separately.

The battery life of a quartz watch depends mainly on two factors: 1 the capacity of the battery; 2 the power consumption of the watch movement circuit. The larger the battery capacity, the lower the power consumption of the circuit, and the longer the battery life.

The capacity unit of the watch battery is expressed in milliampere hours (maH). Depending on the size of the battery, the capacity of the general silver oxide battery is between several mAh and several tens of milliamperes. The larger the volume, the larger the capacity. Big. The power consumption of the watch circuit is micro-ampere, and the current IC circuit level can be about 1 microamp. Theoretically, battery life is equal to battery capacity divided by circuit power consumption.

From the point of view of the use, RENATA's battery is more expensive, the appearance is also more refined, but the battery sealing performance does not seem to be as good as Japan's, the phenomenon of climbing alkali has occurred, all Swiss quartz watches such as Randy, Rolex are used RENATA, a Japanese-made battery with a Seiko brand. Be aware that even the same battery size, the battery capacity of different manufacturers is not the same, there is a table of indicators on the silver oxide battery, which gives detailed data on the voltage, size and capacity of all batteries.

The current quartz watch circuit is variable pulse width, and the power consumption of the circuit is directly related to the circuit pulse width output. The larger the pulse width, the greater the power consumption. Usually when the watch is placed in the calendar or in the vertical position, The pulse output of the circuit to the stepping motor will become larger, so it is necessary to place it horizontally at night to take off the watch.

Any semiconductor silicon material is sensitive to temperature, and the higher the temperature, the greater the operating current. Therefore, the watch cannot be placed near the heater for a long time, and there is any heat source. Any semiconductor silicon material is sensitive to light, especially sunlight, especially represented by a liquid crystal display or a quartz watch with a liquid crystal display + pointer display type, because light may be transmitted to the watch circuit, which may increase the power consumption of the circuit. , so avoid long-term exposure of the watch to strong sunlight.

The wet environment is more harmful to quartz watches because the watch is not sealed. Once the moisture or humid air enters the case, depending on the degree, severely corroded steel parts will at least greatly increase the watch. The circuit consumes power.

Watches with additional functions such as electric hand adjustment, banding, lighting, altitude, temperature, guide, etc. should minimize the number of uses, especially the noise and lighting functions, which consume thousands of times of electricity. Greater than the normal power consumption of the watch.

Therefore, when we replace the battery, we must pick a good brand, good materials, good quality batteries, so that the life of the watch battery is longer.