The 7.4V 4400mAh 18650 2S2P Lithium Ion Battery Pack is a complete rechargeable power solution combining four 18650 cells in a 2-series 2-parallel configuration.
Unlike loose battery cells, this pack is delivered as a finished assembly with matched cells, integrated protection circuit and ready-to-connect output leads. Customers can directly install the battery pack into their equipment without additional spot welding, cell matching or protection board installation.
The 7.4V voltage platform and 4400mAh capacity provide extended operating time for compact devices where space and runtime are both important.
The internal structure uses:
- Two cells connected in parallel
- Two parallel groups connected in series
- Total configuration: 2S2P
- Nominal voltage: 7.4V
- Total capacity: 4400mAh
Each 18650 cell is selected and matched according to:
- Voltage consistency
- Internal resistance
- Self-discharge performance
This matching process helps maintain balanced charging and discharging performance throughout the battery pack lifecycle.
The 7.4V 4400mAh 18650 2S2P lithium ion battery pack integrates a customized protection circuit board to improve operational safety and battery reliability. The built-in protection system continuously manages charging and discharging conditions, helping prevent potential risks caused by overcharge, over-discharge, overcurrent and short circuits. The balancing function maintains better consistency between cells during use, reducing performance differences within the pack and supporting longer service life.
With a charge limit voltage of 8.4V and a discharge cut-off voltage of 5.6V, the protection system is designed to keep the battery operating within a safe voltage range. Combined with matched 18650 cells, insulation materials and controlled assembly processes, Yideng delivers a complete battery pack solution that is ready for integration into customer devices.
| Item | Specification |
| Model | 18650 2S2P |
| Material | Li-ion Polymer Battery |
| Normal Capacity (0.2C) | 4400mAh |
| Minimum Capacity (0.2C) | 4400mAh |
| Energy | 32.56Wh |
| Normal Voltage | 7.4V |
| Delivery Voltage | 7.4V ~ 11.1V |
| Standard Charge Method | Charge at maximum current. When the battery or pack terminal voltage reaches the charging limit voltage, charge at constant voltage until the charging current is less than or equal to 0.02 C, then stop charging. |
| Discharge Program | The battery or the battery pack carries on the constant current discharge with the maximum discharge current to the discharge termination voltage. |
| Max Charging Current | 1C CC/CV → 0.02C cutoff |
| Max Discharging Current | 1C CC/CV → 3.0V cutoff |
| Over-Discharging Current | 3.0V |
| Operation Temperature Range |
Charging: 0°C ~ 50°C Discharging: -20°C ~ 60°C |
| Allowable Maximum Surface Temperature |
Charging: Tmax ≤ 50°C Discharging: Tmax ≤ 60°C |
| Storage T/H Range (time) |
-20°C ~ 60°C (Less than 1 month) -20°C ~ 45°C (Less than 3 months) -20°C ~ 25°C (Less than 1 year) |
| Cycle Life |
≥ 300 times (Thickness expansion rate ≤ 10%) ≥ 500 times (Thickness expansion rate ≤ 12%) |
The 7.4V 4400mAh 18650 2S2P Lithium Ion Battery Pack is developed for equipment that requires longer operating time within limited installation space.
It is commonly used in:
- Portable electronic equipment
- Electric toys
- Handheld vacuum cleaners
- Portable speakers
- Medical devices
- Backup power systems
For portable devices, the 4400mAh capacity provides extended working time compared with single-cell solutions.
For equipment manufacturers, the finished battery pack design simplifies assembly and shortens product development cycles.
Yideng provides customized battery pack solutions based on different device requirements.
Customization options include:
- Battery pack dimensions
- Wire length
- Connector type
- Heat-shrink color
- Label printing
- Protection board settings
Customers can provide product specifications or battery compartment dimensions, and Yideng engineers can recommend suitable configurations.
Yideng controls the complete battery pack assembly process from cell selection to finished product inspection. Before assembly, individual 18650 cells are tested and grouped according to voltage, internal resistance and self-discharge characteristics. Matched cells are then assembled through precision spot welding using nickel strips, followed by PCM installation, insulation protection, heat-shrink packaging and electrical testing. Each finished pack undergoes charging, discharging and protection function verification before shipment to ensure stable performance and safety during use.
Yideng applies a complete quality management system throughout battery pack production, covering incoming cell inspection, component verification, assembly control and final performance testing.
Each battery pack undergoes strict quality checkpoints, including cell matching, welding inspection, protection function testing and finished product verification. Production records are maintained through batch traceability systems, allowing customers to review manufacturing information when required.
The battery pack complies with international requirements including UL1642 for cells, UL2054 for battery assemblies, UN38.3 for transportation safety, as well as RoHS and REACH material standards.
Before selecting this 7.4V 4400mAh 18650 2S2P Lithium Ion Battery Pack, customers should confirm three key factors:
Voltage Requirement
This pack provides a 7.4V output through a 2-series cell configuration. The equipment must be designed for a 7.4V battery input.
Current Requirement
The continuous discharge capability is 4.4A with a 6.6A peak current rating. Customers should confirm that the device operating current and startup current remain within these limits.
Installation Space
The standard pack size is approximately 68 × 36 × 18mm excluding wires. Battery compartment dimensions, connector position and wire exit direction should be confirmed before production.
Yideng can adjust pack structure and wiring design according to customer requirements.
For new projects, Yideng supports sample evaluation before mass production.
Sample testing includes:
- Capacity verification
- Voltage consistency testing
- Internal resistance measurement
- Protection function testing
- Charge and discharge evaluation
Customers can confirm battery performance, connector compatibility and installation requirements before placing bulk orders.
Yideng provides technical and quality support throughout the product lifecycle.
If customers encounter battery performance issues, Yideng provides professional analysis based on test data and production records. For confirmed quality problems related to battery capacity, protection functions or manufacturing defects, replacement solutions are provided according to warranty terms.
With a 12-month warranty period and continuous engineering support, Yideng helps customers maintain stable battery supply for long-term projects.
A1: 2S2P means two battery cells are connected in series to achieve 7.4V voltage, while two parallel groups increase the total capacity to 4400mAh.
A2: Yes. The pack includes an integrated protection circuit board supporting overcharge, over-discharge, overcurrent, short circuit protection and cell balancing.
A3: Yes. Yideng supports OEM customization including connector types, wire length, lead direction, packaging and labeling requirements.
A4: Yes. The battery pack is supplied as a finished product with matched cells, protection board and output leads, reducing the need for customer-side assembly.
A5: It is suitable for portable electronic devices, electric toys, medical equipment, portable speakers, handheld vacuum cleaners and backup power applications.
A6: Yideng matches cells based on voltage, internal resistance and self-discharge characteristics before assembly, then performs finished pack testing to ensure reliable performance.
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Xin'an Village industrial Park, Yonglejiang Town, AnrenCounty, Chenzhou City, Hunan Province, China
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