Understanding Battery Specifications: 370, 371, LR69, LR920, LR921, SR69, SR920SW

Button cell batteries like 370, 371, LR69, LR920, LR921, SR69, and SR920SW are small power sources for devices like calculators, watches, and medical tools. Key differences include chemistry (alkaline vs. silver oxide), voltage (1.5V vs. 1.55V), and compatibility. Always verify size and chemistry before replacement to avoid device damage.

Global Batteries

How to Identify 370, 371, and LR-Series Button Cell Batteries?

Battery codes reveal size and chemistry. For example, “LR” denotes alkaline (e.g., LR69), while “SR” signifies silver oxide (e.g., SR920SW). The 370 (9.5mm diameter) is larger than the 371 (9.2mm). Cross-reference manufacturer charts or use calipers to confirm dimensions. Misidentification can lead to leaks or reduced performance.

To ensure accurate identification, measure batteries with digital calipers. The 370 battery measures 9.5mm wide × 3.6mm tall, while the 371 is slightly narrower at 9.2mm. LR-series batteries typically feature engraved lettering on the positive terminal, including the ISO code and expiration date. Many manufacturers now include QR codes on packaging that link to technical specifications. When cross-referencing replacements, consult this comparison table:

Battery	Diameter	Chemistry	Common Devices
370	9.5mm	Alkaline	Calculators
371	9.2mm	Silver Oxide	Watches

Why Does Battery Lifespan Vary Between SR69 and LR69 Models?

SR69 (silver oxide) maintains 1.55V until depletion, lasting 25% longer than alkaline LR69 in continuous-use devices. LR69 voltage drops gradually, better for intermittent use. Example: An SR69 lasts 18 months in a watch vs. 12 months for LR69. Temperature extremes reduce alkaline performance by up to 40%.

The performance gap stems from different chemical reactions. Silver oxide batteries (SR69) utilize AgO decomposition, producing a more stable electron flow. Alkaline models (LR69) rely on zinc-manganese dioxide reactions that degrade faster under load. For devices drawing 0.1-0.3mA continuously, SR69 provides 2000 hours vs. LR69’s 1500 hours. However, in intermittent-use devices like remote controls where current draws occur in short bursts, both types perform similarly. Consider these usage patterns:

Device Type	Recommended Battery	Average Lifespan
Digital Thermometer	SR69	2 years
TV Remote	LR69	3 years

What Is the Chemistry Behind LR69 vs. SR920SW Batteries?

LR69 uses alkaline chemistry (1.5V), ideal for low-drain devices. SR920SW employs silver oxide (1.55V), offering stable voltage for precision devices like glucometers. Silver oxide batteries last longer in high-drain applications but cost 20-30% more. Never mix chemistries in the same device.

Which Devices Use LR920 and LR921 Batteries?

LR920 powers small electronics: laser pointers, LED lights, and mini remotes. LR921, slightly thicker (2.1mm vs. 2.0mm), fits hearing aids and car key fobs. Both are alkaline, but check device manuals—some require silver oxide equivalents like SR920SW for temperature resistance.

How to Properly Store Unused LR921 or SR920SW Batteries?

Store at 15-25°C in original packaging, away from metal objects. Relative humidity below 50% prevents corrosion. Refrigerating alkaline batteries (LR-series) extends shelf life by 5-10%, but condensation risks exist. Silver oxide (SR) batteries shouldn’t be refrigerated—stable at room temperature for 5-7 years.

What Are the Risks of Using Counterfeit 371 or SR69 Batteries?

Counterfeits often use subpar zinc alloys, increasing leak risk by 300%. A 2022 study found 34% of “discount” button cells failed safety tests. Authentic batteries have laser-etched codes and tamper-proof packaging. Leaked electrolytes can permanently damage $200+ devices like digital calipers.

When Should You Choose Silver Oxide (SR) Over Alkaline (LR) Batteries?

Use SR batteries in: 1) Medical devices (stable voltage), 2) -10°C to 60°C environments, 3) High-drain gadgets like GPS trackers. Alkaline LR suits infrequently used devices: TV remotes, clocks. SR batteries provide 400+ cycles in cardiac monitors vs. 150 for alkaline.

“Consumers often underestimate the precision required in button cell selection. A 0.3mm size difference or 0.05V variance can disable safety-critical devices. Always match OEM specifications—third-party ‘equivalents’ may save $2 but risk $200 repairs.” – Senior Engineer, Battery Tech Consortium

Conclusion

Understanding battery specifications prevents device failures and safety hazards. Key factors: size (ISO codes), chemistry (voltage stability), and OEM compatibility. Silver oxide excels in precision tools, while alkaline suits general electronics. Verify authenticity and store properly to maximize performance.

FAQs

Can I Use LR920 Instead of SR920SW?

Not recommended. SR920SW’s silver oxide chemistry provides stable 1.55V for medical devices. LR920’s 1.5V alkaline may cause errors in glucose meters.

Why Do 371 Batteries Cost More Than 370?

371 batteries (9.2mm) use rarer nickel-plated steel casings for corrosion resistance. 370 (9.5mm) employs standard zinc. Price difference: $0.50-$1.50 per unit.

Are LR69 and SR69 Interchangeable?

Only if the device allows 1.5-1.55V range. Digital thermometers often require SR69’s precision. Check device manual—voltage mismatch can reduce accuracy by 15%.