LR626 Battery vs SR626SW Battery - 377, AG4, LR66, SG66 Battery Equivalents

LR626 and SR626SW batteries are button/coin cell batteries often used in wrist watches, toys, digital cameras, remote controls, car keys, thermometers, and similar.

LR626 and SR626SW batteries share the same physical dimensions, but they differ in chemistry and thus in their features and specifications. To help with the confusion even more, some manufacturers often use other labels for both batteries, including LR66, SR66, AG4, GA4, SG4, 376, 377, etc.

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LR626 and SR626SW Batteries Features and Specifications

LR626 and SR626SW batteries share the same physical dimensions of (D x H) 6.8 x 2.6 mm, with their main difference being their chemistry.

LR626 battery is an Alkaline Battery, featuring a nominal voltage of 1.5 volts, a cutoff voltage of 0.9-1.0 volts, and a nominal capacity of 15-18 mAh.

skoanbe lr626 w200pxNote that a nominal capacity depends on the device being powered by LR626 battery, drain current, temperature, battery age, and similar.

LR626 battery is often labeled as AG4 battery, LR66 battery, alkaline 376 battery, alkaline 377 battery, and similar - regardless of the label, these are alkaline coin/button (D x H) 6.8 x 2.6 mm batteries.

The shelf life of LR626 batteries is 3-5 years, rarely more.

SR626SW battery is a Silver-Oxide Battery, featuring a nominal voltage of 1.55 volts, a cutoff voltage of 1.2 volts, and a nominal capacity in the 25-30 mAh range.

The actual capacity of the SR626SW batteries also depends on the device, maximum and average drain current, battery temperature, age, and similar.

sony sr626sw w250pxSome manufacturers offer low-drain and high-drain SR626SW batteries, with the low-drain SR626SW batteries having higher capacity, but are not recommended for watches with alarms, LED lights, and similar features that require relatively strong currents.

For devices that require relatively strong currents, high-drain SR626SW batteries are recommended, although they feature lower capacity when compared with low-drain SR626SW batteries.

Thanks to the advances in technology, most manufacturers these days offer so-called multi-drain SR626SW batteries, featuring large capacity and good tolerance to the high-drain currents.

 The shelf life of the SR626SW batteries is at least 3-5 years, often even more, depending on the brand.

LR626 vs SR626SW Watch Battery

When LR626 and SR626SW watch batteries are being compared, note that:

- LR626 is somewhat cheaper than SR626SW battery, with the actual difference being almost negligible,

- SR626SW features higher nominal voltage and more stable actual voltage during use,

- SR626SW battery features significantly better capacity,

- SR626SW features longer shelf life.

When comparing the features and performances of LR626 and SR626SW batteries, if the price of these two batteries is approximately the same, go for the SR626SW battery.

LR626 and SR626SW Battery Safety Issues

Modern LR626 and SR626SW batteries are free of heavy pollutants like mercury, cadmium, and similar.

But, they are small and shiny objects that can attract kids and pets which can swallow them - although these batteries don't feature heavy elements, when body fluids close the circuit, electrolysis starts that can cause internal burns and other injuries.

That is why LR626, SR626SW, and other similar batteries come in the so-called pets/kids safe packages.

Nonetheless, if these or similar batteries get swallowed, immediately contact Your local emergency center and act according to their instructions.


sr626sw w150pxLong Story Short: LR626 and SR626SW batteries are very popular coin cell batteries and are easy to find at local hardware stores, watch repair shops, or online stores.

If You are looking for a coin cell battery with physical dimensions of (D x H) 6.8 x 2.8 mm, go for a good SR626SW battery from a reputable brand, especially if You need it for some electronic device/gadget that requires stable voltage.