Silver oxide battery usage guide - application and recycling
Did you know that not all button batteries like 2450 battery are lithium batteries. The AG and LR marks on the back shell is alkaline manganese battery, and the SR ones is silver oxide battery. This article will introduce what is silver oxide battery, its characteristics and teach you how to use and discard silver oxide battery.
What is a silver oxide battery
A silver oxide battery is a type of dry battery (disposable battery). Also known as silver battery or silver zinc battery. Most of the products are button-shaped, widely used in small electronic devices, and are also used for special purposes due to their excellent characteristics such as long-term storage.
The silver oxide battery (SR battery) is a silver oxide battery whose cathode electrode active material is silver oxide (Ag), and the anode electrode active material is zinc (Zn). The electrolyte is a small primary battery with potassium hydroxide (KOH) (W type) or sodium hydroxide (NaOH) (SW type). It has the characteristics of large capacity and stability, and is widely used in medical equipment and precision instruments such as watches.
Cathode electrode reaction: Ag: O + HO + 2e”→2Ag+2OH7
Anode electrode reaction: Zn+20H7→ZnO+HO+2e
Total reaction: Ag:O+Zn → 2Ag+ZnO
Features of silver oxide battery
Like mercury batteries, silver oxide batteries have an extremely smooth discharge voltage curve. But its operating voltage is 1.5V (open circuit voltage is 1.6V). Silver oxide batteries have about the same ampere-hour capacity as mercury batteries.
Silver oxide batteries are important power sources for hearing aids and electric meters. Its cathode is the depolarized oxide of silver oxide and manganese dioxide. With different applications, the composition of the mixture is different; the anode electrode is zinc.
Silver oxide battery used in hearing aids (requires low leakage current, long service life), the electrolyte is strongly alkaline potassium hydroxide, in order to enhance its energy density; and the silver oxide battery used in electronic watches (very low leakage current, extremely long service life), its electrolyte is sodium hydroxide (50-diumHydroxide) with better stability.
Silver oxide battery has a long life, and their functions are not affected at high temperatures; even in low temperature environments, their functions are still stronger than most mercury-zinc batteries. Since the materials required for silver oxide batteries are more expensive, the main types of silver oxide batteries are button type and other smaller-sized types.
D-size or larger rechargeable silver oxide batteries, sealed and vented are good; However, if the high price factor of other types of silver oxide batteries is not considered, the application of sealed type and vented type batteries will be limited.
Application of silver chloride battery
● As watch battery
● Medical equipment
● IoT-related devices
● Various precision instruments and measuring devices
● Electronic scales
● Computer motherboard
● Remote controller
● Cash registers
How to distinguish the quality of silver oxide battery
The surface of good silver oxide battery is polished very brightly, the trademark and letters are clearly imprinted, and the letters printed on the side indicate the date of production. The surface of fake and inferior batteries is generally rough, the imprint is also very vague, and the service life is extremely short. Factors that affect silver oxide battery life generally include two factors: One is the capacity of the battery itself. The larger the battery capacity and the lower the power consumption, the longer the service life.
The second is the power consumption of the device. For example, the power consumption of quartz watches is about 1 microampere, and the battery capacity is about 4~40 mAh, and the lithium battery capacity should be larger. Generally speaking, the smaller the watch, the smaller the battery, the smaller the capacity, and the relatively shorter service life; a watch with two needles is more durable than a battery with three needles or more.
Precautions for using silver oxide battery
■ Forbid silver oxide battery to withstand strong vibration. Dropping, throwing or stepping on the battery may cause deformation, leakage, overheating or explosion.
■ Choose the right type of battery for the device. Due to differences between individual device models and usage conditions. This battery may not be suitable for a particular device. Please select the appropriate battery according to the operating instructions of the device.
■ It is strictly forbidden to place silver oxide battery in a high temperature environment (for example, in an area exposed to direct sunlight or in a car when the weather is hot). Placing in these places may cause the battery to deform, leak, overheat or explode.
■ Do not store silver oxide battery in high temperature or high humidity environment. Putting them in these places may cause the performance of silver oxide battery to degrade. In some cases, it can also cause the battery to deform, leak, overheat or explode.
■ Do not let the silver oxide battery get wet. Exposure to water may cause the battery to rust or cause deformation, leakage, overheating or explosion.
How to discard a silver oxide battery
Since the zinc in the anode electrode can react chemically with the components in the electrolyte, it will be corroded and consumed. This will not only reduce the available capacity of the battery, but also generate hydrogen gas, causing the internal pressure of the battery to increase and expand. In order to suppress such effects, a small amount of mercury is usually coated on the zinc surface, but it also causes mercury pollution to the environment by discarded batteries.
The battery clip of the silver oxide battery can also be recycled, therefore, the silver oxide battery should be recycled to avoid polluting the environment. Button batteries basically do not contain heavy metals, and the environmental risk is small. At the same time, due to the small size and the high cost of recycling and regeneration, there is currently no recycling channel. Therefore, button batteries can be discarded directly. National or regional regulations may require this battery. Please observe the corresponding regulations and standards.
Because there is still residual power in a discarded battery, contact with other metals may cause the battery to deform, leak, overheat or explode. Therefore, the cathode (+) and anode (-) terminals of the battery should be covered with insulating tape or other insulating materials before discarding.