Energizer 390/389 Silver Oxide Button Cell Batteries - 1.55V (10 Pack)

The Energizer 390/389 is a 1.55V silver oxide button cell battery supplied in a 10-pack. Each cell measures 9.5mm diameter by 3.1mm height (approximately 24mm x 24mm x 5mm per blister card) and uses silver oxide chemistry to deliver stable voltage output across the battery's discharge cycle, making it suited to precision devices such as analogue watches, digital calculators, medical instruments and small remote controls.

The 390 and 389 designations refer to the same physical cell with equivalent voltage and capacity—the dual numbering reflects different manufacturer coding systems (IEC SR1130W and Timex 280-45 equivalents). Silver oxide chemistry provides higher energy density and more consistent voltage than alkaline alternatives in the same size, which is why it's specified for devices that require stable power output rather than just peak current.

Each cell is sealed in a leak-resistant housing to protect the device if the battery is left installed past its service life. The 10-pack format suits users maintaining multiple watches or devices, or stocking spares for intermittent-use equipment. Energizer rates the shelf life at several years when stored at room temperature in the original packaging, meaning the pack can be kept as standby inventory without significant capacity loss.

What's the difference between 390 and 389 batteries?

They are the same physical cell with identical voltage and capacity. The different numbers reflect manufacturer coding systems—390 is the IEC designation (SR1130W), while 389 is used by some watch and instrument makers. Energizer labels this cell as 390/389 to confirm cross-compatibility.

What devices use 390/389 batteries?

Common applications include analogue wristwatches, digital calculators, medical glucose meters, laser pointers, small LED lights, hearing aid testers and compact remote controls. Check your device's battery compartment or manual for the size code—if it specifies 390, 389, SR1130W, SR1130, AG10 or 280-45, this Energizer cell is compatible.

How long do silver oxide batteries last?

Service life depends on the device's power draw. In a typical analogue watch drawing 1-2 microamps, a 390/389 cell can last 2-3 years. In higher-draw devices such as calculators or medical instruments the lifespan is shorter. Silver oxide cells maintain stable voltage until near the end of their capacity, then drop off sharply rather than fading gradually.

Can these replace alkaline AG10 batteries?

Physically yes—AG10 is the alkaline equivalent size. However, silver oxide provides more stable voltage and higher capacity than alkaline in button cell sizes, so devices designed for silver oxide may not perform correctly on alkaline substitutes. If the device specifies 390/389 or SR1130, use silver oxide rather than AG10 alkaline.