What Is A 232 Battery?
A 232 battery is a 3V lithium coin cell, typically measuring 20mm in diameter and 3.2mm in height. It’s designed for low-power devices like watches, calculators, and key fobs, offering stable voltage and a shelf life up to 10 years. Using lithium manganese dioxide (LiMnO₂) chemistry, it delivers ~200mAh capacity and operates between -30°C to 60°C. Proper disposal is critical due to toxic materials.
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What are the technical specifications of a 232 battery?
The 232 battery features a 20mm diameter, 3.2mm height, and nominal 3V output. Its LiMnO₂ chemistry ensures stable discharge, with capacities ranging from 190–220mAh. Operating temperatures span -30°C to 60°C, making it suitable for harsh environments. Pro Tip: Check device voltage tolerances—even a 0.3V drop can impair sensitive electronics.
A 232 battery’s 3V output remains steady until 80% depletion, unlike alkaline cells that gradually decline. For example, a car key fob using a 232 battery typically lasts 2–3 years. Transitionally, higher-end devices like medical sensors demand precise voltage, where lithium’s flat discharge curve excels. But what happens if you mix 232 and alkaline cells? Voltage mismatches can cause leakage or device failure. Always replace all batteries in a multi-cell device simultaneously.
| Parameter | 232 Battery | Alkaline Equivalent |
|---|---|---|
| Voltage | 3V | 1.5V |
| Capacity | 200mAh | 150mAh |
| Lifespan | 10 years | 5 years |
How does a 232 battery differ from CR2032?
While both are 3V lithium cells, the 232 battery is thinner (3.2mm vs. CR2032’s 3.8mm). This size difference prevents interchangeability in tightly fitted devices. Pro Tip: Use a caliper to verify compartment depth before substituting.
The CR2032 offers higher capacity (225mAh vs. 200mAh) due to its thicker design. For example, a 232 battery might power a hearing aid for 14 days, while a CR2032 extends to 17. However, slimmer devices like ultrathin calculators can’t accommodate CR2032’s extra 0.6mm. Moreover, CR2032 cells are more widely available, but forced insertion risks damaging battery contacts. Why does thickness matter? It affects spring contact pressure—too loose, and connections become intermittent.
What devices commonly use 232 batteries?
232 batteries power compact electronics: glucose monitors, keyless entry fobs, and LED jewelry. Their slim profile suits space-constrained designs. Pro Tip: Store spares in sealed bags to prevent humidity-induced corrosion.
Medical devices like digital thermometers rely on 232 batteries for stable power in critical applications. Transitionally, a single cell can run a kitchen scale for 18 months. Real-world example: Fitness trackers often use 232 cells due to their 1–2mA average draw. But why not use rechargeables? Most 232-powered devices lack charging circuits, and lithium’s self-discharge rate (<1% yearly) outperforms NiMH.
| Device | Usage Duration | Load Current |
|---|---|---|
| Key Fob | 3 years | 0.1mA |
| Calculator | 5 years | 0.05mA |
| Thermometer | 2 years | 0.2mA |
How should 232 batteries be stored?
Store 232 batteries at 15–25°C in dry conditions. Avoid temperatures above 60°C, which accelerate self-discharge. Pro Tip: Place a silica gel packet in storage containers to absorb moisture.
Lithium coin cells lose <5% charge annually when stored properly. For instance, a 232 battery stored for 5 years retains ~80% capacity. Transitionally, refrigerating batteries isn’t recommended—condensation during warming can short-circuit terminals. Always check expiration dates; expired cells may leak corrosive electrolytes. What’s the safest disposal method? Use tape to cover terminals before recycling to prevent fires.
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FAQs
No—CR2032’s 3.8mm height may damage slim devices. Verify compartment dimensions first.
Are 232 batteries rechargeable?
No—attempting to recharge them can cause leaks or explosions. Use disposable lithium cells only.