The 12851 battery replacement refers to the process of swapping out a CR12851 lithium coin cell battery commonly used in small electronics like key fobs, calculators, and medical devices. This 3V button cell measures 12.8mm in diameter and 5.1mm in height, characterized by high energy density and stable discharge curves. Replacement requires proper polarity alignment, anti-static precautions, and disposal of depleted cells through certified recycling programs.
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What tools are needed for CR12851 replacement?
Essential tools include plastic tweezers (to avoid short-circuiting), isopropyl alcohol wipes for contact cleaning, and anti-static mats. Specialty tools like battery insertion clips help seat cells securely in tight compartments without damaging the casing.
Successful CR12851 swaps require three-phase preparation: First, disable the device’s power completely—some implants and security systems have backup capacitors needing discharge. Second, use non-metallic tools to prevent accidental terminal bridging. Third, verify replacement battery authenticity; counterfeit cells often show voltage drops below 2.8V under load. Pro Tip: Place a small dab of dielectric grease on contacts to inhibit oxidation. For example, replacing a car key fob’s CR12851 typically restores 18-24 months of operation, but forcing batteries into undersized slots can rupture the lithium seal.
How does CR12851 differ from similar coin cells?
Compared to CR2032 (20mm diameter) or CR1620 (16mm), the CR12851 offers balanced footprint compatibility for space-constrained designs. Its 5.1mm profile fits spring-loaded holders better than thinner cells.
While all lithium coin cells share similar chemistry, the CR12851’s dimensions and capacity (typically 150mAh) make it ideal for moderate-power devices needing monthly battery changes rather than annual replacements. However, its niche size creates availability challenges—always cross-reference equivalent models like DL12851 or ECR12851. Did you know? Some hearing aids use modified CR12851 variants with titanium coatings to resist body moisture corrosion. A common mistake is substituting with CR1220 batteries, which might physically fit but deliver insufficient runtime.
| Parameter | CR12851 | CR2032 |
|---|---|---|
| Diameter | 12.8mm | 20mm |
| Capacity | 150mAh | 225mAh |
| Typical Use | Key fobs | Motherboards |
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FAQs
No—primary lithium coin cells aren’t designed for recharging. Attempting to recharge may cause rupture or fire.
Why does my new CR12851 drain quickly?
Likely causes: counterfeit battery, dirty contacts, or device malfunction. Test battery voltage under load—authentic cells maintain ≥2.7V at 5mA draw.
