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7.4V Lithium ion Battery Pack Manufacturer

  • Manufacture 7.4V 2 series lithium battery pack since 2010.
  • PCM (protection board) customized available. 
  • It can be a series combination of lipo batteries and 18650 batteries.
  • PVC wrap, ABS, Metal housing can be chosen.
  • Short-circuit, over-current, over-voltage protection.
7.4V lithium battery

What is the 7.4V lithium-ion battery pack?

18650 2S1P 7.4V 4400mAh

Below is a simple explanation of each parameter:

  1. 4.4Ah capacity, when the lithium battery is fully charged, the voltage is up to 8.4V. It can last 1-hour running time when the discharge current is at 4.4Ah.
  2. 1C rate, usually max pulse discharge rate 2C. As we all know, the discharge current will be changed with the load. It can support 1C 4400mA current to discharge.
  3. 2S1P means that the battery is composed of two 3.7V series connected in series, one parallel connected, and the total voltage is 7.4V. By connecting batteries in parallel, the voltage can be kept constant and the discharge current can be increased, but the battery life will not be prolonged.
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What are application of 7.4V lithium-ion battery pack?

The important characteristics of the 7.4V lithium-ion battery pack are: high energy, high density, high voltage, no pollution, no metal lithium, high cycle life, no memory effect, and fast charging. So it has received the attention of many industries.

Because of its attention, it has a wide range of applications. Let’s take a look at it in general.

  • Laser measuring instrument, laser distance meter, laser langefinder, digital laser.
  • CCTV camera, video camera, digital camera, network camera, Analog Camera.
  • Neck massage, shoulder massage, cordless massage, back massage.
  • Portable printer, thermal printer, hand held printer, coding printer, label barcode printing.
  • LED torch, flashlight, camping light, outdoor light, outdoor camp.
  • Medical device with battery, blood pressure monitor, glucose meter, physical therapy equipment.

Detailed explane of 7.4V lithium battery charging circuit diagram

  • circuit design image as the right.

  • This part of the circuit is to output 8.4V to charge the lithium battery.

    TP5100 is a switching step-down dual-cell 8.4V/single-cell 4.2V lithium battery charge management chip.

    TP5100 has a wide input voltage of 5V-18V. The battery charging is divided into three stages: trickle precharge, constant current, and constant voltage. The trickle precharge current and constant current charging current are adjusted by external resistors, and the maximum charging current is up to 2A.

circuit design
  • A typical constant current circuit is composed of LM317 and R1, R2, and R3 (431 temporarily considers that disconnecting R4 is relatively large, so you can ignore it first). Maintain a constant charging current when the voltage is not too high. Take the charging of two batteries as an example. Under ideal conditions, the charging current should be constant until the voltage reaches 8.3V. When the voltage at point A reaches the inflection point value of 8.3V, after the partial pressure of R4 and R5, TL431 starts to turn on, and gradually pulls the reference point voltage of LM317 from 8.3V down. The so-called inflection point is the point where the current begins to drop. Until the voltage reaches the 0 current point of 8.4V, point A still maintains this 8.3V voltage, the output Vout of LM317 drops to 8.4V, and its adjustment end drops to 7.17V.
circuit diagram

Quality Products

  • Our lithium-ion battery pack conforms to Li-ion battery national standard GB/T18287/2020.
  • Each battery meets the demand of Rohs2.0 REACH requirements
  • With ZERO complaint principle to proceed all manufacturer works.
  • We will help you to get all the necessary certificates, some of the commonly known ones are listed below:
    UN 38.3
    IEC 62133
    UL 2054
    MSDS
    Air & Sea Transportation Report
3D illustration of a rubber stamp mark with thumb up and text high quality over paper background

Lithium Battery Process Work Flow

We are a professional lithium battery factory in China. Now we briefly introduce how to produce lithium batteries. It starts from cathode & anode mixing, coating, baking, calendering, automatic slitting & cutting, winding, top & side sealing, electrolyte injection, pressing formation, forming, capacity grading, OCV1 & OVC2, cell to PCB, insulation and shipping. Welcome to contact and ask for the workflow table list.

Need Any Customized 7.4V Lithium-ion Battery Pack?

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You will receive the charge & discharge curve

  • 12S2P Battery Pack, It is a 5A charge & 10A discharge curve test as a sample for your review.

Time - voltage & current

Capacity - voltage

Time - capacity & specific capacity

Cycle number-charge capacity & discharge capacity & charge specific capacity & discharge specific capacity

Product & Factory Certificates

  • All batteries are require related certification apart from lab testing, such as voltage, current measure, and each countries have different certificate demand.
  • Clients are welcome to have any 3rd party certification company verify our batteries or the factory documents.
  • We have been working with UL, TUV, SGS certication lab. All batteries approved by UL1642, UN38.3, IEC62133, PSE, KC, CB, MSDS certificate or report.
battery certificate

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Why choose us, HLC?

  • Safety & Reliability
    All Battery cells will pass rigorous testing. All Battery Packs are Certified and are compliant with regulatory and safety requirements. 
  • Certifications
    CE, ROHS, FCC certification and high reliability. UL 1642, MSDS, UN 38.3, IEC 62133,KC,PSE,BIS certifications and more available.
  • Customer support
    Quick turn-around on battery assemblies(10-20 Days). 24*7 services are available.

Reliable & durable lithium-ion battery manufacturer in China with over 10 years experience. 

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We will contact you within 1 working day, please pay attention to the email with the suffix “@hlcbattery.com”.