Where is the plus and minus pole of a coin cell?

The negative pole is on the top and the positive pole on the slightly wider bottom. The plus side often shows the brand and type number; this side is almost always on top when inserting the battery.

Why is there a sticker on a zinc-air battery?

It is only when you take the sticker off this battery that the air activates it. Oxygen penetrates the battery through holes. Because the activated material comes from outside, there is more room in the battery for capacity. This way, the lifetime is long and the discharge curve is flat. The air-alkaline battery works pretty much the same way.

Are there rechargeable coin cell batteries?

There are various types of rechargeable batteries. They are usually built into the various devices. They are rarely available in shops, partly due to the low demand.

Can coin cell batteries withstand high and low temperatures?

The maximum permissible temperatures for a battery are -55° and +125° Celsius. However, the best working environment for most cells is one where temperatures are between +10° and +35° Celsius.

What is the specific feature of alkaline coin cells?

They can deliver high currents as the initial voltage level is 1.5 Volts. However, after a while, the voltage drops relatively fast. That is why these batteries are less suitable and reliable for cameras and measuring equipment.

Why do lithium coin cells last so long?

Lithium batteries last a very long - up to ten years - even when they are hardly used at all. The self-discharge per year is only 1% of the capacity.

Why is there always silver oxide in the batteries for watches?

The voltage of this system is high and remains constant for quite a long time. The time must always be reliable.

What kind of coin cell batteries are there?

There are several systems. The properties are tailored to the most important applications.

Silver oxide (watches, cameras): High constant voltage, self-discharge less than 5% per year.

Alkaline (electrical appliances): Supplies large currents, voltage drops during use, self-discharge less than 3% per year.

Lithium (cameras and electronic devices): Self-discharge less than 1% per year, not suitable for heavy loads.

Zinc air (hearing aids): High capacity, self-discharge 3% per year (if not activated).

Mercury oxide (electrical appliances, hearing aids and cameras): Supplies large currents, self-discharge 2% per year, environmentally unfriendly 15% mercury.

Mercury-containing batteries have not been manufactured since 1998 and have not been supplied by factories since 1999. A replacement zinc air battery is available for a small number of these batteries.

What is a coin cell battery used for?

There are many applications. The most important are watches, cameras and hearing aids. In addition, calculators, games and car alarms are major consumers.

What is a coin cell or button battery?

A button cell is a round battery whose diameter is usually greater than its height. Sometimes they are extremely small and then they look like a button or a coin. That is why they are also called button cells.

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