English
Views: 0 Author: Site Editor Publish Time: 2026-11-07 Origin: Site
Button cell batteries (also called coin cells) are small, flat, disc-shaped primary or secondary batteries. They get the name from their button-like appearance.
Most button cells are non-rechargeable primary batteries, widely used for low-current, long-standby electronic products. They are compact, sealed, stable in voltage and have a very long shelf life.
The model name tells you chemistry, shape, diameter and thickness.
First letter: Chemistry system
Second letter: Shape, R = Round
First two digits: Diameter (mm)
Last two digits: Thickness (0.1 mm)
Example: CR2032
C = Lithium Manganese Dioxide
R = Round
20 = 20 mm diameter
32 = 3.2 mm thickness
The standard working voltage marked on the battery. Different chemistries have fixed nominal voltage, cannot mix.
How much energy the battery can supply. Button cell capacity is small, usually from tens to hundreds of mAh. It fits low drain devices, not high-power equipment.
Most coin cells are low-drain type. Continuous discharge current is small. If you use them for high pulse or heavy load, voltage will drop quickly and service life becomes very short.
Storage life before use. Good CR lithium coin cells can keep more than 80% capacity after 10 years storage.
Type |
Nominal Voltage |
Feature |
Rechargeable |
Typical Model |
|---|---|---|---|---|
CR Lithium Manganese Dioxide |
3.0V |
Long shelf life, stable voltage, wide temperature range, low self-discharge |
No |
CR2032, CR2025, CR2016 |
SR Silver Oxide |
1.55V |
Stable voltage, high capacity, for precision watches |
No |
SR44, SR626SW |
LR Alkaline |
1.5V |
Low cost, general purpose |
No |
LR44, LR626 |
LIR Lithium-ion Rechargeable |
3.7V |
Can be charged repeatedly |
Yes |
LIR2032 |
Model |
Diameter |
Thickness |
Nominal Voltage |
Typical Capacity |
|---|---|---|---|---|
CR2032 |
20 mm |
3.2 mm |
3.0V |
220–240 mAh |
CR2025 |
20 mm |
2.5 mm |
3.0V |
150–170 mAh |
CR2016 |
20 mm |
1.6 mm |
3.0V |
70–90 mAh |
LR44 / AG13 |
11.6 mm |
5.4 mm |
1.5V |
110–130 mAh |
SR626SW |
6.8 mm |
2.6 mm |
1.55V |
25–30 mAh |
Non-rechargeable (CR / SR / LR) One-time use. Cannot be charged. Long shelf life, low self-discharge, lower cost for most low-power devices. This is the most popular type on market.
Rechargeable (LIR) 3.7V lithium-ion coin cell. Can cycle hundreds of times. But capacity is lower than CR, self-discharge is higher, and needs dedicated charging circuit.
⚠️ Important: Never charge a non-rechargeable CR/SR/LR button cell. It may leak, heat up or burst.
Car remote key, smart door lock
Quartz watch, fitness tracker, hearing aid accessories
Motherboard CMOS battery, PLC, memory backup power
Thermometer, blood glucose meter, smart sensor, IoT tag
Toy, LED light, electronic gift, calculator
Do not short circuit the positive and negative terminals.
Do not heat, puncture, disassemble or throw into fire.
Keep away from small children. Swallowing button cells is extremely dangerous.
Do not mix old and new batteries, or mix different chemistry batteries in one device.
Stop using immediately if leakage, strange smell or swelling appears.
Store in cool, dry place, avoid high temperature and humid environment.
Check the original model printed on the old battery first.
Confirm voltage: 3.0V /1.5V /1.55V /3.7V must match.
Check physical size: diameter and thickness must fit the battery holder.
Confirm drain requirement: Low drain for watch/backup memory; silver oxide for precision watch.
Check certification: CE, RoHS, UN38.3, MSDS for export goods.
Yes. CR series lithium manganese dioxide coin cells nominal voltage is fixed at 3.0V. The voltage will drop gradually when discharging.
Not recommended. Even the diameter is same, thickness is different. It cannot fit the battery holder properly, and the capacity is lower.
They have similar size, but voltage and discharge curve are different. SR44 is 1.55V silver oxide, LR44 is 1.5V alkaline. It may work temporarily but not stable for precision watch.
No. LIR2032 is 3.7V rechargeable lithium-ion. CR2032 is 3.0V primary lithium. Wrong replacement will damage your device.
Depends on device current draw. For motherboard backup, it can last 3–5 years. For car key, usually 1–3 years.
NACCON supplies standard button cells and custom coin cell battery packs for global customers. We support OEM & ODM, can provide solder tabs, wire leads, connector, PCB assembly, different packaging and full certification documents. If you need custom button cell packs, please send us your requirements: target voltage, capacity, size, discharge current, connector, working temperature and certification standard.
