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CR2032 Button Battery Holder, THT Mounting, 2 Pins, Compatible with CR2025
Plastic holder for CR2032 button cell battery, also compatible with CR2025, ideal for quick mounting on electronic boards and DIY projects. Provides stable fixing and secure contact, allows easy battery replacement, has compact dimensions and a sturdy construction for long-term use.
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The CR2032 button battery holder is a plastic housing with metal contacts that securely holds a 3 V lithium cell and connects it to the circuit through two soldering pins. It is suitable for low-consumption projects, for example as a backup battery for a real-time clock (RTC) module, for memories that must retain their data, or for simple LED circuits.
The holder accepts CR2032 batteries with a 20 mm diameter and also CR2025 batteries, which have the same diameter but are thinner. The positive contact is a metal clip that rests on the top face of the battery and on its edge, while the negative contact is a flat spring located under the battery. The spring gently pushes the battery into the clip, so the contact is maintained even when the board vibrates.
The main features include the plastic housing with a side opening for inserting the battery, the metal retaining clip, the flat contact spring and the two pins for through-hole (THT) mounting on a breadboard or PCB. The circuit is powered directly by the battery inserted in the holder, at a nominal 3 V.
Specifications:
Supply voltage: 3 V (from the inserted battery)
Accepted batteries: CR2032 and CR2025
Battery diameter: 20 mm
Mounting type: THT, through-hole
Number of pins: 2
Housing material: Plastic
Contacts: Metal, clip for the + pole and spring for the - pole
Layout:
| Element | Function |
|---|---|
| Plastic housing | Contains the battery and keeps it in place in the holder. |
| Metal retaining clip | Rests on the top face (+) of the battery and on its edge, and the battery slides under it during mounting. It is connected to pin +. |
| Flat contact spring | Touches the bottom face (-) of the battery and gently pushes it into the clip, for a secure contact. It is connected to pin -. |
| Pin + (under the side tab with the clip) | Soldering pin for the positive pole of the battery. |
| Pin - (on the opposite edge) | Soldering pin for the negative pole of the battery. |
Pinout:
| Connector | Pin | Function |
|---|---|---|
| CR2032 holder | + | Positive pole, 3 V. This is the pin under the side tab with the metal retaining clip. |
| CR2032 holder | - | Negative pole, ground (GND). This is the pin on the opposite edge, connected to the spring under the battery. |
Usage:
Identify the pins before mounting, because the holder has no + and - markings on the pins. The + pin is the one under the side tab with the metal clip, and the - pin is the one on the opposite edge.
Fully insert the two pins into the holes of the breadboard or PCB and solder them with a short heating time, because the plastic deforms if it stays too long on the soldering iron.
Do not mount the battery while soldering, because the heat can damage it.
After cooling, check with a multimeter set to continuity that the two pins are not shorted.
Insert the battery with the + face (the one with the inscription) facing up. Slide it first under the metal clip, then gently press the opposite side until it fully enters the holder.
To remove the battery, push it from the spring towards the clip and lift it out, without using sharp metal objects.
Measure the voltage at the two pins with the multimeter set to DC volts. A new battery shows approximately 3 V, and below 2.5 V the battery is depleted and must be replaced.
Do not apply to the holder any voltage other than that of the battery and respect the polarity, because the holder has no reverse polarity protection.
Use the holder for circuits that operate at 3 V and require small currents, from a few microamps up to a few milliamps. Do not use it for motors, relays or other high-current loads.
Remove the battery from the holder when you are not using it, so that it does not discharge into a circuit that remains connected.
- Supply voltage
- 3 V
- Number of pins
- 2
- Mounting
- THT, through-hole
- Housing material
- Plastic
- Diameter
- 20 mm
- Battery type
- CR2032 and CR2025
Produs destinat utilizarii in proiecte electronice, automatizari, prototipare, educatie si cercetare.
Produsul trebuie utilizat numai conform specificatiilor tehnice mentionate in descriere si/sau in documentatia produsului.
Avertismente generale de siguranta:
Nu utilizati produsul la tensiuni, curenti sau temperaturi peste valorile specificate.
Montajul si conectarea trebuie realizate de persoane cu cunostinte tehnice minime in domeniul electric/electronic.
Evitati scurtcircuitele, inversarea polaritatii si conectarea gresita a alimentarii.
Nu lasati produsul alimentat nesupravegheat in timpul testelor.
Produsul nu este jucarie si nu este destinat copiilor.
Pentru modulele electronice, se recomanda utilizarea in carcase, panouri sau montaje protejate, dupa caz.
Identificare produs:
Denumirea produsului, codul/SKU-ul si caracteristicile tehnice sunt mentionate in pagina produsului si/sau pe eticheta ambalajului.
Producator / Importator / Distribuitor:
Sigmanortec S.R.L.
Calea Bucuresti nr. 9, Targu Jiu, Gorj, Romania
E-mail: [email protected]
Website: www.sigmanortec.ro
Persoana responsabila in UE:
Sigmanortec S.R.L.
Calea Bucuresti nr. 9, Targu Jiu, Gorj, Romania
E-mail: [email protected]
Documentatie si siguranta:
Pentru informatii suplimentare, fise tehnice, declaratii de conformitate sau instructiuni, ne puteti contacta la [email protected].
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In this tutorial we use the CR2032 coin cell battery holder as a standalone power source, without a development board and without a program. The holder has two through-hole (THT) terminals, it is soldered onto a breadboard or a PCB, and it keeps a 3 V CR2032 battery in secure contact.
It is used in small projects, for example as a backup battery for a real-time clock (RTC) module, for memories that must keep their data, or for circuits with LEDs and low consumption. Here you will mount the battery in the holder, identify the terminals and build a test circuit with a 5 mm red LED and a 100 ohm resistor.
How it works:
The holder is a plastic housing with two metal contacts. One contact is a clip that rests on the top face of the battery (the + pole) and on its edge. The other is a flat spring, placed under the battery, which touches the bottom face (the - pole). The clip holds the battery in place, while the spring pushes it gently into the clip, so that there is contact even when the board vibrates. Each contact is connected to one of the two solder pins.
The CR2032 battery is a lithium cell with a nominal voltage of 3 V, a diameter of 20 mm and a typical capacity of about 235 mAh. The holder also accepts CR2025 batteries, which have the same diameter and are thinner. These batteries are designed for small currents, from a few microamps up to a few milliamps. They are not suitable for motors, relays or other loads that require high current.
For the test circuit, the resistor limits the current through the LED. A red LED has a forward voltage drop of about 2 V. The formula is R = (U battery - U LED) / I. For a desired current of 10 mA we get R = (3.0 V - 2.0 V) / 0.01 A = 100 ohms.
The actual current will be lower, because the battery has internal resistance and its voltage drops when it is loaded. The power dissipated by the resistor is about 10 mW, so a 1/4 W resistor is sufficient. At 10 mA a 235 mAh battery discharges in a few hours, and the usable capacity at this current is even lower than the nominal one. That is why the circuit is suitable for testing, not for continuous operation.
Connection:
The holder has no + and - markings on the pins. The + pin is the one under the side tab with the metal retaining clip. The - pin is the one on the opposite edge, connected to the spring under the battery. The available voltage is 3 V, so the circuits powered are those that accept 3 V. For 5 V inputs the voltage is too low. Check the polarity with a multimeter before soldering.
| Product pin | Connect to | Role |
|---|---|---|
| + (pin under the metal clip) | 100 ohm resistor, end 1 (the other end goes to the LED anode, the long leg) | Positive supply, 3 V |
| - (pin on the opposite edge, connected to the spring) | LED cathode (the short leg, the side with the flat cut) | Ground (GND) |
Setup:
The holder has no buttons, potentiometers, jumpers, LEDs or display, so there are no settings to make. The preparation consists of mounting and checking it. Follow the steps below in order.
Solder the holder onto the breadboard or PCB, with the two pins fully inserted into the holes. Use a short heating time, because the plastic deforms if it stays too long on the soldering iron. Do not mount the battery during soldering, because the heat can damage it.
After cooling, check with a multimeter set to continuity that the two pins are not shorted to each other. Then insert the battery, with the + face (the one with the markings) facing up. Slide it first under the metal clip, then gently press the opposite side until it snaps fully into the holder. To remove it, push the battery from the spring towards the clip and lift it out, without using sharp metal objects.
Measure the voltage at the two pins with the multimeter set to DC volts. A new battery shows about 3 V. If the value is negative, you have reversed the probes. The pin where you placed the red probe and read a positive value is the + pin. If the measurement is below 2.5 V, the battery is depleted and must be replaced.
The holder has no reverse polarity protection. If the battery sits in the holder with the + face up, the polarity is correct, but the PCB mounting must respect the + pin described above.
Usage example:
The example powers a 5 mm red LED from the CR2032 battery through the 100 ohm resistor.
Prepare the parts: the holder with the CR2032 battery mounted, a 100 ohm 1/4 W resistor (brown, black, brown, gold bands) and a 5 mm red LED. On the breadboard, connect the + pin of the holder to one end of the resistor. Connect the other end of the resistor to the LED anode, that is the long leg. Connect the LED cathode, the short leg next to the flat side, to the - pin of the holder.
The result is that the LED lights up immediately, with medium brightness. The current is at most 10 mA, so the LED is not damaged. If you want to see the current, insert a multimeter set to mA in series with the LED. You will read a value below 10 mA.
For a real application, for example a backup battery for a DS1307 or DS3231 RTC module, connect the + pin to VBAT and the - pin to the GND of the module. The consumption in this case is in the order of microamps, so the battery lasts a long time. Do not use the resistor and the LED from the example anymore.
After testing, remove the battery from the holder if you are not using it, so that it does not discharge into a circuit that remains connected.
Common problems:
The LED does not light up. The most frequent cause is the LED mounted in reverse or the battery inserted reversed. Check that the long leg of the LED goes towards the resistor and that the + face of the battery is facing up, under the clip. Also check the battery voltage with the multimeter.
The LED lights weakly. The battery is almost depleted or the contact is poor. Measure the voltage while the LED is connected. If it drops well below 2.5 V, replace the battery. Clean the contacts with a dry cloth if they are dirty or oxidized.
The battery moves or comes out of the holder. Check that you inserted it under the metal clip and that you pressed the opposite side until it was fully locked. Also check that the battery has a diameter of 20 mm, meaning it is a CR2032 or CR2025 type.
The plastic of the holder is deformed after soldering. The pins were heated for too long. Solder quickly, with a well-cleaned iron, and let the holder cool before inserting the battery.
No voltage is measured at the pins. Check the contact between the battery and the clip, or the spring, and the continuity of the solder joints. Also check that the battery is not completely discharged.
Limitations and tips:
The holder and the CR2032 battery are suitable only for small currents, from a few microamps up to a few milliamps. At high currents the battery voltage drops, and the usable capacity is much lower than the nominal capacity of about 235 mAh.
The 3 V voltage is too low for circuits that require 5 V. The holder has no reverse polarity protection, so respect the + and - pins when mounting.
Avoid prolonged heating during soldering and do not use sharp metal objects when removing the battery. The holder can be used further as a backup battery for RTC modules, for memories that retain their data, or for small circuits with LEDs, where the consumption remains very low.
