Description
BAK 2S 7.4V 45000mAh 2S9P 3C Lithium-Ion Battery Pack | Rechargeable NMC Battery
The BAK 2S 7.4V 45000mAh 2S9P 3C Lithium-Ion Battery Pack is a high-capacity rechargeable NMC lithium-ion battery pack designed for applications requiring a compact 7.4V power source with high energy capacity and strong discharge capability.
This battery pack uses BAK 21700 5000mAh cells arranged in a 2S9P configuration, providing 7.4V nominal voltage, 8.4V maximum charging voltage, and 45Ah / 45,000mAh capacity.
With 3C-rated cells, the pack is suitable for applications requiring higher current output, subject to the selected BMS, wiring, connectors and thermal management.
Key Features
- Brand: BAK
- Battery Chemistry: NMC Lithium-Ion
- Configuration: 2S9P
- Nominal Voltage: 7.4V
- Maximum Charge Voltage: 8.4V
- Capacity: 45Ah / 45,000mAh
- Cell Type: BAK 21700
- Cell Capacity: 5000mAh
- Cell Discharge Rating: 3C
- Total Cells: 16
- Rechargeable battery pack
- High-capacity configuration
- High theoretical discharge capability
- Suitable for portable and high-power applications
- Custom BMS, connector and wire options available
2S8P Battery Configuration
The battery contains 16 BAK 21700 cells arranged as 2S9P:
- 2 cells/groups in series
- 9 cells in parallel
- 8 × 5000mAh = 45,000mAh / 45Ah
- 2 × 3.7V = 7.4V nominal
- 2 × 4.2V = 8.4V full charge
- Nominal energy: 7.4V × 45Ah = 333Wh
The 8P arrangement increases the battery’s capacity and available current capability, while the 2S arrangement determines the pack voltage.
3C Discharge Capability
Based on the 45Ah pack capacity:
45Ah × 3C = 135A theoretical current
The 135A figure should not automatically be treated as the guaranteed continuous discharge current of the finished battery pack. The actual allowable current must be determined by the cell specifications, BMS rating, busbars/nickel connections, wiring, connectors and thermal management.
BMS Protection
A suitable 2S BMS can provide protection against:
- Overcharge
- Over-discharge
- Over-current
- Short circuit
- Cell imbalance
- Temperature-related conditions when temperature sensing is included
Select the BMS current rating according to the actual application and required load.
Connector & Wire
The battery can be supplied with application-specific connectors and wiring.
Possible options include:
- XT60
- XT90
- DC connectors
- JST connectors
- Custom power connectors
- Custom wire length
- Separate charging and discharge connections
Applications
- Portable Power Equipment
- Robotics
- RC Applications
- Drones and UAV Systems
- Industrial Electronics
- Medical Equipment
- CCTV & Security Equipment
- Backup Power Systems
- Portable Instruments
- Custom Lithium Battery Projects
- OEM Battery Packs
Advantages
- High 45Ah capacity
- BAK 21700 NMC cell configuration
- 333Wh nominal energy
- 2S8P configuration
- High theoretical 3C current capability
- Suitable for high-capacity rechargeable applications
- Custom BMS and connector options
- Suitable for OEM and custom battery requirements
Package Includes
- 1 × BAK 2S 7.4V 45000mAh 2S9P Lithium-Ion Battery Pack
- 2S BMS according to selected configuration
- Output/charging connector according to specification
- Battery wiring and insulation
- Protective packaging/enclosure according to selected design
Important Charging Information
Use an 8.4V Lithium-Ion/NMC charger specifically designed for a 2S NMC battery pack.
Do not use a 12.6V charger, LiFePO₄ charger or another incompatible charger.
Always verify the charger voltage/current, BMS rating and battery specifications before charging.
