Modern man uses many portable electrical appliances. Each such device requires its own battery, which can only be replaced by an analog from another manufacturer. In this article, we will talk about the 921 or LR921 power supply.
Content
Specifications 921
It is a galvanic cell of compact size in shape resembling a tablet. The electrodes are the upper and lower faces. When replacing a used power source, it is important not to reverse polarity. Manufacturers on the case of the element usually marks the contacts with the corresponding signs: "+" and "-".
The working specifications of alkaline element 921 are reflected in the following table:
| Parameter | Value |
|---|---|
| Basic designation | 921 |
| View | Alkaline |
| The form | Tablet (Coin) |
| Capacity | 30-40 mA / h |
| Voltage | 1.5 V |
| Analog 921 | Read more HERE |
| Diameter | 9.5 mm |
| Height | 2.15 mm |
| Working temperature | from +10 to + 40˚C |
| Working storage | from - 20 to + 30˚C |
| Weight | 0.4 gr |
| Shelf life | more than 10 years |
Demanded goods are delivered to stores in blister packs of 10 pieces, can be sold individually. The average price of one item is 9-10 rubles.
Battery Applications
The considered energy source is used by manufacturers in electronic products of compact dimensions and low weight. These are the following products:
- quartz watches
- laser pointers
- mini calculators and game consoles,
- mobile radios and television sets,
- alarm systems
- Kids toys,
- medical devices
- other small-sized electronics.
Analogs of the battery 921
If necessary, it is possible to replace only with an element with equivalent dimensions and technical characteristics: a similar voltage of 1.5 volts. The capacity can be any, the larger it is, the longer the device will work.
As an analogue, “tablets” with the following marking are suitable:
Can I charge the 921 battery
The alkaline battery cannot be charged. The manufacturing technology of the product based on obtaining current by alkaline chemical reaction does not provide such an opportunity.
It is undesirable to dispose of the “tablet” that has developed its resource together with household garbage; it is recommended to take it to specialized collection points for disposal.
Popular manufacturers and their features
In the market, quite a lot of companies produce a battery of this size and capacity but with different markings. Separately, it is worth highlighting the following popular brands:
- Duracell - more than 80 years in the market of galvanic and battery power sources.
- Camelion - more than 40 years.
Also in the product range of such well-known brands of electronics manufacturers as Maxell, Panasonic, Sony, Toshiba there are current sources of this format.
What to look for when purchasing
When a miniature original energy source of the class in question develops its supply in an electronic device, the user is forced to choose a replacement option. The element with the designation LR921 from the salt analog is characterized by high efficiency, performance and service life.
When buying, you should carefully examine the appearance of the "tablet": on the case there should not be traces of rust, turbidity or white coating. The date of manufacture should also be clarified, it should be more than 3 years.
