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Standard Batteries and Custom Battery Packs

Reliable Li-ion, LiPo and LiFePO4 battery packs, chargers and cells, with custom BMS, cable, connector and pack

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3.7V 4000mAh Li-ion 21700 Battery with Button Top Protection PCB
3.7V 4000mAh Li-ion 21700 Battery with Button Top Protection PCB
3.7V 4000mAh Li-ion 21700 Battery with Button Top Protection PCB
3.7V 4000mAh Li-ion 21700 Battery with Button Top Protection PCB
3.7V 4000mAh Li-ion 21700 Battery with Button Top Protection PCB
3.7V 4000mAh Li-ion 21700 Battery with Button Top Protection PCB
3.7V 4000mAh Li-ion 21700 Battery with Button Top Protection PCB
3.7V 4000mAh Li-ion 21700 Battery with Button Top Protection PCB
3.7V 4000mAh Li-ion 21700 Battery with Button Top Protection PCB
3.7V 4000mAh Li-ion 21700 Battery with Button Top Protection PCB

3.7V 4000mAh Li-ion 21700 Battery with Button Top Protection PCB

Protected 21700 lithium-ion cells for rechargeable-battery applications. Standard-model sourcing and OEM/ODM available.

Customization Options

  • Protection PCB
  • Terminal configuration and packing method

Key Features

  • 3.7V nominal voltage and 4000mAh capacity
  • 21700 format with Button Top positive terminal
  • Built-in protection plate with short circuit, overcharge, and discharge protection
  • 3C maximum continuous discharge rating
  • 800 rechargeable cycles stated in the source gallery

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ItemKBT21700-4000-PCB
ManufacturerKBT BATTERY
ChemistryLithium-ion
Size21700
Diameter21mm
Length76mm
Positive TerminalButton Top
Capacity4000mAh
Continuous Discharge Rating (max)3C
Nominal Voltage3.7V
Maximum Voltage4.2V
Discharge Cut-off Voltage2.5V
ProtectedYes
Protection FunctionsShort Circuit Protection, Overcharge Protection, Discharge Protection
RechargeableYes
Rechargeable Cycles800
Approx. Weight72g

3.7V 4000mAh Li-ion 21700 Battery with Button Top Protection PCB