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SR626/SR626SW Single-Use Batteries

If you use a keyless remote to unlock your car, a laser pointer to give presentations, or a pocket calculator to total up a check at lunch, you need battery power. The batteries for these devices are known as coin, button, or watch batteries. They are all referred to as SR-type single-use batteries.

What are coin and button batteries?

These batteries are about the size and shape of a small coin or button. They are often called watch batteries because many timepieces use them. They power a wide variety of other devices as well. Whatever the name, they provide power for a long time, using small amounts of power only when needed.

Are there different types of single-use watch batteries?

Yes, these batteries come in three types, based on their chemistries. They are alkaline, lithium, and silver oxide. Batteries of the same size come in all three types, so you can use them interchangeably. There are some notable differences between them, such as power output and battery life. The main difference between lithium and silver oxide watch batteries is the amount of voltage they produce.

How do you know what type you are buying?

Every watch battery comes with a code that indicates the type, size, and other information. An example is SR626SW. All watch batteries with the "SR" prefix are silver oxide. The number 626 indicates size, and the "SW" suffix indicates the battery is a low-drain type, meaning it will keep its charge longer. While SR626SW is one specific code, this battery is also known as an SR66 or an AG4. The full code, whether for a low-draining battery like the SR626SW or a high-draining type like the SR626W, will always appear on the packaging.

How is the power of these batteries rated?

The two main measurements of power are milliamperes per hour (mAh) and voltage. Milliamperes per hour measure capacity, meaning how much current the battery can provide to a device in an hour. The more current required, the sooner the battery will lose its charge. For example, a battery with a rating of 40 mAh can provide 40 milliamps for an hour. The same battery can deliver 20 milliamps for 2 hours or 10 milliamps for 4 hours. Voltage measures electrical potential. Silver oxide batteries rate at 1.5 volts, while lithium ones rate at 3 volts.