Types of Button Batteries / Coin Cells

🔹 Primary (Non-rechargeable)

1. CR Lithium  Manganese Dioxide (Li-MnO₂, 3.0V)｜Most widely used

          Models: CR2032, CR2025, CR2016, CR2450, CR2430, CR1632, CR2477

     ✅ Advantages: Low self-discharge, long shelf life (8–10 years), wide operating temperature range, high energy density

     📌 Applications: Computer CMOS, car remote keys, smart wearables, sensors, thermometers, security devices

2. BR Lithium Carbon Monofluoride (Li-CFₓ, 3.0V)

         Models: BR2032, BR2025

     ✅ Advantages: Ultra-low self-discharge, extremely long storage life, high temperature resistance; low current output

     📌 Applications: Industrial meters, water/gas meters, long-term backup power, high-end IoT

3. SR Silver Oxide (Ag₂O, 1.55V)｜Watch batteries

          Models: SR626SW (AG4), SR44SW (AG13), SR621SW

      ✅ Advantages: Extremely stable discharge voltage, higher capacity than LR type, good leakage resistance

     📌 Applications: Quartz watches, precision photometric instruments

4. LR Alkaline Manganese (Alkaline, 1.5V)｜AG series

         Models: LR44=AG13, LR41=AG3, LR626=AG4

      ✅ Advantages: Low cost, abundant supply

      ❌ Disadvantages: Unstable voltage, prone to leakage after long storage

     📌 Applications: Toys, small calculators, simple electronic gifts

5. PR Zinc-Air (Zn-Air, 1.4V)｜Hearing aid batteries

         Models: PR44, PR48, PR70

       ✅ Advantages: Very high energy density; activated once the seal tab is removed and exposed to air

      ❌ Disadvantages: Short service life after activation, sensitive to humidity

      📌 Applications: Hearing aids

6. Carbon Zinc Manganese (1.5V)

         Old low-cost type, low capacity and easy leakage; rarely used nowadays

🔹 Rechargeable Button Cells

1. LIR Lithium-Ion (3.6/3.7V)

         Models: LIR2032, LIR2450

      📌 Applications: Rechargeable, alternative to CR for real-time clock and small modules

2. ML / VL Rechargeable Lithium Manganese (3.0V)

          Models: ML2032, VL2020

       ✅ Features: Suitable for microampere trickle charge, ideal for RTC backup on mainboards

3. Ni-MH Nickel-Metal Hydride Button Cells (1.2V), Ni-Cd Nickel Cadmium (obsolete)

         Mostly used in assembled button battery packs

✅ Naming Rule

Prefix = Chemistry system; first two digits = diameter (mm); last two digits = thickness × 0.1 mm

Example: CR2032 → Lithium manganese, Φ20 mm, thickness 3.2 mm

⚠️ Important Note

Batteries with different voltages cannot be interchanged directly!

CR=3V, SR=1.55V, LR=1.5V, PR=1.4V, LIR=3.7V. Do not substitute even if they share the same outline size.