Product Description
Lithium Polymer Battery Pack 105556 3.7v 7.4V 4000mAh 14.8wh 29.6wh Rechargeable Lipo Battery Cell
| NO. | Items | Specifications |
| 1 | batteries | 7.4V 4000mah lipo battery |
| 2 | Charge voltage | 8.4V |
| 3 | Nominal voltage | 7.4V |
| 4 | Nominal capacity | 4000mAh 0.2C Discharge |
| 5 | Charge current
| Standard Charging:0.2C
Rapid charge: 1.0C |
| 6 | Standard Charging method | 0.5C CC(constant current)charge to 4.2V, then CV(constant voltage 4.2V)charge till charge current decline to ≤0.05C |
| 7 | Charging time
| Standard Charging:2.75hours(Ref.)
Rapid charge: 2hours(Ref.) |
| 8 | Max.charge current | 0.5C |
| 9 | Max.discharge current | 1.0C |
| 10 | Discharge cut-off voltage | 2.5V0.25V(0.2C) |
| 11 | Operating temperature | Charging: 0 °C ~45 °C
Discharging:0 °C ~45 °C |
| 12 | Storage temperature | -10°C~ +45 °C |
| 13 | Dimension | Length:60±0.5mm (not including tabs)
Width:56±0.5mm
Thickness:22±0.2mm |
| 14 | Drop Test | The cell is to be dropped from a height of meter twice onto concrete ground. No fire, no leakage |
| 15 | cycle time | ≥800times |
Advantages:
High Energy Density:
With a nominal voltage of 7.4V and a capacity of 4000mAh, this high energy density meets the needs of high-power devices such as portable speakers and projectors.
Safety:
Using polymer cells, they are explosion-proof and leak-proof, offering superior safety compared to standard 18650 lithium batteries.
Cycle Life:
Most products boast a cycle life exceeding 500 cycles (with ≥80% capacity retention), making them suitable for long-term use.
Wide Temperature Range:
Supports an operating temperature range of -20°C to 60°C, adapting to a wide range of scenarios.
Lightweight:
Each unit weighs approximately 45-47 grams, making it compact and portable.
Multi-Device Compatibility:
Some models support multiple devices, including speakers, amplifiers, and massagers.
Typical Applications:
Li-Po:
Portable electronics (smartphones, tablets, wearables), drones, RC toys, and thin devices needing flexible power.
Cylindrical Li-ion:
Electric vehicles (Tesla’s 21700 cells), laptops, power tools, and large energy storage systems (due to standardized sizes and high energy density).
LiFePO₄:
Electric buses, e-bikes, solar/wind energy storage, backup power, and applications prioritizing safety and long life (e.g., marine, grid storage).
Application:
Outdoor devices
Commonly used in devices such as projectors and power banks, they support extended outdoor use. For example, a modified projector can use this battery pack to achieve high-definition outdoor projection with sufficient brightness and stable battery life.
Electronic tools
Suitable for power tools (such as drills and saws), security equipment (such as smoke alarms and intercoms), and medical devices (such as hearing aids and electronic wheelchairs). Its high capacity meets high power requirements.
Consumer electronics
This includes digital products (such as MP3/MP4 players and e-book readers), toys (such as remote-controlled car models and model airplanes), and smart home devices (such as robot vacuums and sweepers).
In addition, this battery pack is also suitable for emergency lighting (such as mining lamps and lawn lamps) and beauty devices (such as electric beauty devices).
Pictures:
