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Tag Archives: Custom 4000mAh Battery

4000mAh Li-ion Battery
08 Nov
NEWS

Reliable and Highest Capacity 18650 4000mAh Li-ion Rechargeable Battery Cell – True Capacity, Maximum Performance

  • December 15, 2025
  • By author-avatar Keeppower
  • 2 comments

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    • Menu
    • Categories
    • New Products
    • Classic Protected Batteries
      • 14430/14500/14650
      • 16340/16650/RCR123A
      • 18350/18500
      • 18650
      • 21700
      • 26650/26800
      • Protected High Discharge/R Series
      • Low Temperature Batteries
      • Others
    • USB Protected Batteries
      • TYPE C
      • Micro USB
    • High Discharge Batteries
      • 18650
      • Others
    • Customized Battery Packs
      • Li-ion 18650 Battery Packs
      • Li-ion 21700 Battery Packs
      • Other Li-ion Battery Packs
      • Sonar/ROV/AUV/Robot Batteries
      • Hydrofoil Surfboard Batteries
      • For FPV drone and UAV
      • Prismatic Battery Packs
      • LiFePO4 Battery Packs
    • High Capacity Cells
      • 18650
      • 21700
      • Others
    • High Discharge Cells
      • ≤3C
      • 3C-8C
      • ≥8C
    • Chargers/Power Banks
    • Accessories
      • Battery Cases
      • Battery Spacers
      • Connectors
      • PCM
      • USB Adapters
      • USB Cables
    • Home
    • PRODUCTS
      • New Products
      • Classic Protected Batteries
        • 18650
        • 21700
        • 26650/26800
        • 14430/14500/14650
        • 16340/16650/RCR123A
        • 18350/18500
        • Protected High Discharge/R Series
        • Low Temperature Batteries
        • Others
      • USB Protected Batteries
        • TYPE C
        • Micro USB
      • High Discharge Batteries
        • 18650
        • Others
      • Keeppower Selected Cells
      • Customized Battery Packs
        • Li-ion 18650 Battery Packs
        • Li-ion 21700 Battery Packs
        • Other Li-ion Battery Packs
        • Hydrofoil Surfboard Batteries
        • Sonar/ROV/AUV/Robot Batteries
        • Prismatic Battery Packs
        • LiFePO4 Battery Packs
        • For FPV drone and UAV
      • High Capacity Cells
        • LiFePO4-IFR
        • 21700
        • 18650
        • Others
      • High Discharge Cells
        • ≤3C
        • 3C-8C
        • ≥8C
      • Chargers/Power Banks
      • Accessories
        • Connectors
        • PCM
        • Battery Cases
        • Battery Spacers
        • USB Adapters
        • USB Cables
    • ABOUT US
    • NEWS&DOWNLOADS
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