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18650 4S Battery Holder, 4 Cells in Series, 14.8V Nominal, with Cable
Holder for 4 x 3.7 V 18650 batteries, ideal for quickly building a 4S pack in electronics projects and DIY applications. Provides secure fixing and stable electrical contact, has wires for easy connection, robust construction in durable plastic, simple mounting and quick access for replacing the cells.
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The 18650 4S battery holder houses four 18650 Li-ion cells connected in series and brings them out on two wires, red for plus and black for minus. It is suitable for portable power packs of about 14.8 V, used for fans, LED strips, small pumps, robots, control modules and other loads that need 12 V or more, usually through a voltage regulator.
The four compartments are connected to each other in series, so the cell voltages add up. With cells of 3.7 V nominal the result is 14.8 V, with fully charged cells at 4.2 V the pack gives 16.8 V, and with cells discharged to 3.0 V the voltage drops to 12 V. The capacity in mAh remains equal to that of a single cell. The holder contains no regulation or protection electronics, so it does not limit the current and does not stop the discharge or charging of the cells.
The main features include the four black plastic compartments with spring metal contacts, the + markings moulded into each compartment for the orientation of the cells, the mounting holes at the bottom of the compartments, and the two output wires, red and black, with stripped ends. The holder does not need a power supply, because it is itself the energy source when it contains cells.
Specifications:
Nominal voltage: 14.8 V (4 x 3.7 V)
Pack voltage range: 12 - 16.8 V (3.0 - 4.2 V per cell)
Cells: 4 x 18650
Cell connection: Series (4S)
Capacity: Equal to that of a single cell
Protection: No protection circuit or BMS
Terminals: Red (+) and black (-) wires, with stripped ends
Housing: Black plastic, spring metal contacts
Dimensions: 80 x 76 x 20 mm
Layout:
| Element | Function |
|---|---|
| Cell compartments (4 pieces) | House the four 18650 cells, connected to each other in series. The orientation of the cells alternates from one compartment to the next. |
| Flat plate | Contact for the positive (+) terminal of the cell. |
| Metal spring | Contact for the negative (-) terminal of the cell and holding it in the compartment. |
| + markings in the compartments | Show the direction in which each cell is placed. |
| Red wire | Plus of the 4-cell pack. |
| Black wire | Minus of the 4-cell pack. |
| Mounting holes | Allow the holder to be fixed with screws in a housing or on a support. |
Usage:
Install four 18650 cells of the same type, with the same capacity and the same state of charge, with the positive terminal facing the flat plate of each compartment, according to the + marking in the compartment.
Do not mix old cells with new cells and do not use cells with different charge levels, because in series they discharge unevenly, and the weakest one may drop below the permitted limit.
Measure the voltage at the ends of the wires before making any connection. You should read between about 12 V and 16.8 V, depending on the charge of the cells, and a much lower value or a value close to zero shows that a cell is inserted in reverse or is not making contact.
Connect the red wire to the plus of the load or regulator and the black wire to the minus, observing the polarity. Do not touch the ends of the wires together while the cells are installed.
Do not connect the pack directly to a 12 V load, because a full pack gives 16.8 V. Use a step-down voltage regulator between the pack and the load.
Stop using the pack when its voltage drops towards 12 V, and charge the cells with a suitable charger, outside the holder, each cell separately.
Remove the cells from the holder if you will not use the pack for a longer period.
- Dimensions
- 80 x 76 x 20 mm
- Rated voltage
- 14.8 V (4 x 3.7 V)
- Protections
- No protection circuit or BMS
- Housing material
- Black plastic, spring metal contacts
- Configuration
- Series (4S)
- Battery type
- 4 x 18650
- Number of cells
- 4
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].
Reviews (4) - Review moderation
foarte bun
Produsul este de calitate 10/10
E ok. Firele se pot lipi foarte usor unde este nevoie.
Livrare rapida si produs de calitate
The 18650 4S battery holder is a portable power source: four Li-ion cells connected in series, with two output wires, red for positive and black for negative. It is used in projects that require 12 V or more, for example fans, LED strips, small pumps or robots.
In this tutorial we put the holder into operation step by step, without any program. We power a 12 V, 80 mm fan through an LM2596 step-down module, because the holder has no regulation or protection electronics.
How it works:
The four compartments are connected in series, so the cell voltages add up. With cells of 3.7 V nominal, the result is 4 x 3.7 V = 14.8 V. With cells fully charged to 4.2 V, the pack gives 4 x 4.2 V = 16.8 V. With cells discharged to 3.0 V, the pack drops to 4 x 3.0 V = 12 V. The capacity in mAh remains that of a single cell, because in series the voltage adds up, not the capacity.
For this reason the pack cannot be connected directly to a 12 V load. A full pack gives 16.8 V, which is above what many 12 V loads tolerate. A step-down regulator is placed between the pack and the load. The LM2596 module accepts approximately 4.5 - 40 V at the input and gives 1.25 - 37 V at the output, with a current of up to 3 A. Above approximately 2 A it needs a heatsink.
The output always stays at least 1.5 - 2 V below the input. For a 12 V output, the pack must therefore remain above approximately 13.5 - 14 V. Below this value the output voltage starts to drop along with the pack voltage.
Power consumption calculation for our example: a 12 V fan drawing 0.15 A has a power of 12 V x 0.15 A = 1.8 W. With an approximate regulator efficiency of 85 percent, the pack must deliver approximately 1.8 W / 0.85 = 2.1 W. With cells of approximately 2500 mAh, the energy of the pack is 14.8 V x 2.5 Ah = 37 Wh. This results in a runtime of the order of 15 hours, because the last part of the capacity cannot be used: below 13.5 - 14 V on the pack, the regulator no longer maintains 12 V at the output.
Connection:
Respect the polarity at every step. The red wire of the holder goes to IN+ of the LM2596 module, and the black wire to IN-. A reversed polarity at the input can destroy the module. There are no logic signals, only power. The load is connected only after the output voltage has been adjusted to 12 V.
| Product pin | Connects to | Role |
|---|---|---|
| Red (+) wire of the holder | IN+ of the LM2596 module | Positive of the pack, 14.8 V nominal |
| Black (-) wire of the holder | IN- of the LM2596 module | Negative of the pack, common ground |
| OUT+ of the LM2596 module | Red (+) wire of the fan | Power supply adjusted to 12 V |
| OUT- of the LM2596 module | Black (-) wire of the fan | Load ground |
Buttons, adjustments and indicators:
The holder has no buttons, switch, LED or display. The only adjustment element in the assembly is the trimmer on the LM2596 module, and when fitting the cells, the markings moulded into each compartment matter.
| Element | What it does | How to use it |
|---|---|---|
| Multi-turn trimmer on the LM2596 module | Adjusts the voltage at the OUT+ / OUT- output | Turn it with the brass screw, with the multimeter connected to the output, until 12.0 V. Counterclockwise the voltage decreases, and clockwise it increases. |
| Power LED on the LM2596 module | Shows that the module receives voltage at the input | It lights up after connecting the holder wires to IN+ and IN-. If it does not light up, check the cells and the polarity. |
| + markings in the compartments | Show the direction in which each cell is placed | The flat plate in the compartment is positive, and the spring is negative. The cells alternate in direction, so follow the marking of each compartment. |
| Red and black wires of the holder | Take out the voltage of the 4-cell pack | Red to IN+, black to IN-. |
Adjusting the trimmer, step by step. Start with the module unpowered and the load disconnected. Power the module from the pack and connect the multimeter, set to DC voltage, to OUT+ (red probe) and OUT- (black probe).
Slowly turn the brass screw of the trimmer and watch the reading. If the voltage moves away from 12 V, turn in the opposite direction. Stop when the multimeter shows 12.0 V.
The trimmer has multiple turns, so the variations are small and you must turn patiently. The adjustment is successful when the value remains stable at 12.0 V after waiting a few seconds.
Configuration:
There are no electronic settings to save. The only adjustment is the trimmer, which keeps its position mechanically even after the assembly is switched off. Repeat the adjustment only if you change the load or the desired output voltage. The commissioning steps are the following.
Fit four 18650 cells of the same type and with the same state of charge, respecting the + markings in the compartments.
Measure the voltage at the holder wires and check that it is within the range 12 V - 16.8 V.
Solder or insert the wires into the terminals of the LM2596 module, red to IN+ and black to IN-. Leave the output free.
Adjust the trimmer until you read 12.0 V at the output, as described above. Only then connect the load.
| Pack voltage | State | What happens at the output |
|---|---|---|
| 16.8 V | Cells fully charged | Stable output at 12.0 V |
| 14.8 V | Nominal voltage | Stable output at 12.0 V |
| 13.5 - 14 V | Regulator limit | The output starts to drop below 12 V |
| 12 V | Cells discharged (3.0 V per cell) | Stop using it and charge the cells |
Usage example:
We power an 80 mm, 12 V fan, with two wires (red positive, black negative), which draws approximately 0.15 A. Fit the four cells in the holder, with the positive pole towards the flat plate of each compartment, and measure the voltage at the holder wires. For charged cells you should read approximately 16 V or more.
Connect the red wire to IN+ and the black wire to IN- of the LM2596 module, with the load disconnected. The power LED of the module lights up. Connect the multimeter to OUT+ and OUT- and turn the trimmer until you read 12.0 V.
Then connect the fan, red wire to OUT+ and black wire to OUT-. The fan starts, and the voltage measured at the output must remain at approximately 12 V. With cells of 2500 mAh the assembly works for about 15 hours, until the pack drops below 13.5 - 14 V.
Common problems:
The module LED does not light up and there is no voltage at the output. The usual cause is a cell placed in reverse or one that does not make contact, which leaves the pack without voltage. Measure the voltage at the holder wires, check the + markings in each compartment and clean the contacts.
The output voltage does not rise to 12 V. The pack is too discharged, because the output remains 1.5 - 2 V below the input. Charge the cells and repeat the measurement.
The output voltage drops when you connect the fan. The cause may be a poor contact at the wires or cells that are almost discharged. Check the connections and the voltage of the pack under load.
The LM2596 module heats up. The load draws too much current. Above approximately 2 A the module needs a heatsink, and the maximum current is 3 A.
The module failed after connection. The probable cause is reversed polarity at the input. Always check the red wire at IN+ and the black wire at IN- before fitting the cells.
Limitations and tips:
The holder has no protection against short circuit, overcurrent, excessive discharge or imbalance between cells. Do not let the wire ends touch while the cells are fitted. Stop using the assembly before each cell reaches below 3.0 V.
The holder does not charge the cells. Charge them separately, in a charger suitable for 18650 cells, and always use cells of the same type and with the same state of charge.
The maximum current depends on the cells used and the wire cross-section, so for high loads choose cells with a suitable discharge current and add a fuse in series with the red wire.
Based on this assembly you can build portable packs for LED strips, pumps, robots and control modules, changing only the output voltage of the regulator to suit the desired load.
