503040 3.7V 550mAh Lithium Pouch Battery

Additional information

Rated Voltage


Rated Capacity


Battery Size


Charge Temperature


Discharge Temperature



Bluetooth Earphone

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.

Product Details

Product number: HLC503040
Cell model:503040/3.7V/550mAh
Battery specification: 503040-1S1P/3.7V/550mAh(pouch battery)
Nominal voltage:3.7V
Nominal capacity:550mAh
Charging voltage: 4.2V
Charging current: ≤550mA
Discharging current: ≤550mA
Instant discharging current: 550mA
End-off voltage: 3V
Internal resistance: ≤70mΩ
Battery weight: 11g
Product dimension: 5*30*40mm
Charging temperature:0~45℃
Discharging temperature: -20~60℃
Storage temperature: -20~45℃
Battery case: Aluminum plastic pouch cell
Application field: Bluetooth Earphone

Lithium battery Description:

Lithium-ion polymer batteries are generally named with 6 digits, indicating thickness/width/height respectively. For example, PL503040 indicates a lithium-ion polymer battery with a thickness of 5.0mm, a width of 30mm and a height of 40mm, where PL indicates the battery It belongs to the polymer category. The production process of lithium-ion polymer batteries generally adopts laminated flexible packaging, so the size change is very flexible and convenient, and there are relatively many models.

Lithium polymer batteries (Li-polymer, also known as polymer lithium-ion batteries) have many advantages such as high specific energy, miniaturization, ultra-thinness, light weight and high safety. Based on this advantage, lithium polymer batteries can be made into any shape and capacity to meet the needs of various products; and it is packaged in aluminum-plastic, and internal problems can be immediately manifested through the outer packaging, even if there are potential safety hazards , it will not explode, it will only bulge.

In the polymer battery, the electrolyte plays the dual function of the separator and the electrolyte: on the one hand, it separates the positive and negative materials like a separator, so that self-discharge and short circuit does not occur inside the battery, on the other hand, it acts as a positive and negative electrolyte like the electrolyte. Conduction of lithium ions between the electrodes. Polymer electrolytes not only have good electrical conductivity, but also have the characteristics of light weight, good elasticity, and easy film formation that are unique to polymer materials.

Apart from cell, let us discuss the PCM(protection board). It equips with IC chip and Moseft to the protection of lithium-ion battery from overcharge、over discharge over current and short-circuit. Following are product performance:

  1. Minimal capacity:
    Test: The discharge performance means the time which is measured with discharge current of 0.2C CC(constant current) with 3.0V cut-off voltage within 1 hour after full charge.
    Criteria: ≥1000mAh
  2. Cycle Life:
    ≥500 cycles, more than 80% at std charge/std discharge(25±2℃)≥500
  3. Storage characteristics
    Test: After the standard charge, store in 25℃ for 30days after full charge. After the standard charge, store in 60℃ for 7 days after full charge.
    Criteria: Retention Capacity rate 85%; Restoration capacity rate 90%
  4. Temperature characteristics
    Test: After the standard charge, a cell is stored in an environment of specific temperature for 2 hours, and then discharged to cut-off voltage 3.0V with a constant current of 0.2 C5A.
    Criteria: Capacity rate at -10℃≥ 60% -10 ℃
    Capacity rate at 0℃≥×70% 0℃
    Capacity rate at 45℃ ≥ 100%;
  5. K value Test
    Test: At 25 ℃ environment, constant current constant voltage charging 0.2 C5A to 3.92±0.1V cut-off current 0.02C5A,,the high temperature45℃ for 72h . The normal temperature 25℃ for 96h.
    Criteria: Voltage drop 10mV or less


  1. Which will you do testing before delivering?
    We will test the size, wire, appearance, short-circuit, over-current, capacity, over-charge, over-discharge
  2. How long will you send samples?
    We will deliver samples within 7~15 days.
  3. What’s MOQ?
    We can accept small trial orders.

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