What is a Watch Battery?

Button cell (button cell) is also called button cell, which refers to a battery with a small button shape. Generally speaking, it has a larger diameter and a thinner thickness (compared to a cylindrical battery such as No. 5 AA and other batteries on the market). Button batteries are divided into batteries according to their appearance, and the corresponding corresponding batteries are classified into cylindrical batteries, square batteries, and special-shaped batteries.

Button battery common models

There are several common button batteries according to their chemical composition: carbon, alkaline, zinc-silver oxide, zinc-air, lithium-manganese dioxide, nickel-cadmium rechargeable button batteries, nickel-hydrogen rechargeable button batteries, etc. According to the appearance, there is a distinction between single and laminated. In detail, carbon button batteries are the most common and cheapest. Alkaline is more expensive, but the discharge effect is good. Both voltages are 1.5V, ranging from alkaline AG1 to AG13, with nominal capacities ranging from 15mAh to 140mAh. Suitable for micro-amp discharge requirements. Used in calculators, electronic toys, hearing aids, lighters, watches and more.

Zinc-silver oxide button batteries are considered the best among button batteries. The voltage is 1.55V, the capacity is higher than that of carbon, alkaline button batteries, and the high-order discharge curve is stable. About 90% of the parts are always stable above 1.45V. The discharge curve is almost in a straight line. Go on. The main uses are: calculators, hearing aids, cameras, watches, etc. In particular, this battery has a particularly good leak-proof effect, and it has a good long-term use effect. I used to replace two domestic Dali AG13 batteries that were placed in a SLR camera to power the metering system. It took more than 8 years to replace the new product, and there was no sign of leakage. It's amazing!

In addition to the single-cell battery-powered button batteries, because of their small size, high-voltage batteries have also been developed-that is, multiple button batteries are stacked. Common typical models are:

6F22 (9V) 4F22 (6V), 15F20 (22.5V), 10A (9V), 11A (6V), 23A (12V), 25A (9V), 26A (6V), 27A (12), 476A (6V), 120H7D (8.4V), 2X625A (3V) and so on. Due to the use of button batteries, the assembled battery pack is small and compact, but the discharge intensity is not large. It is mostly used in small motors and small DC power supplies for radio transmission. It should be noted that because high-voltage laminated batteries are mostly produced by ordinary carbon battery combinations, it is generally not easy to store for a long time. When buying, you should pay attention to the production date and try to use products produced within one year. Because of its low cost, coin-cell batteries usually contain harmful substances, which are quite harmful to the environment. This type of battery needs everyone's effective recycling. Don't throw it away randomly.

Button battery environmental impact

Most of the button batteries used are mercury-free batteries, so there is no need to worry about their environmental impact.

The domestic and foreign battery monomer products sold in the market must be marked with mercury content (the method for labeling the mercury content of battery products varies among domestic environmental protection battery manufacturers, including "low mercury", "mercury-free" or "mercury 0", Mercury is 0 ", etc.). When consumers buy a battery, they only need to look at the mercury content of the battery to know if it is an environmentally friendly battery.

Coin cell battery precautions

Button battery recycling: In alkaline batteries, silver oxide batteries, and zinc-air batteries that use zinc electrodes, the zinc in the negative electrode can react with the components in the electrolyte, which will be corroded and consumed, which will not only reduce the availability of the battery Capacity, and may generate hydrogen, causing the internal pressure of the sealed battery to increase and expand. In order to suppress this effect, the zinc surface is usually covered with a small amount of mercury, but it also causes the environment to cause mercury pollution from waste batteries. Although mercury-free button batteries have been put on the market, mercury-free button batteries are not yet popular due to technical or patent reasons.

Button batteries are not yet within the scope of the mercury-free ban for ordinary dry batteries, and a small amount of mercury is still allowed, and must be recycled in accordance with the instructions of environmental protection units. ^[3]