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  • F21i Minimalist Power Bank + Charger
  • USB-C fast charging
  • F21i Adapter with EPDM elastic band
  • F21i Adapter
5000 mAh iSeries Battery
Short USB-C cable
  • Power bank + charger
  • 18W 2-way USB-C fast charging
  • Revolutionary 21700 iSeries battery
  • Touch sensor power display
  • Ultralight
  • Charge your phone
  • Battery charger
  • Multiple protection safeguards
  • EPDM elastic band
  • Specifications

Nitecore® F21i Minimalist Power Bank + Charger


    Adapter+Battery or Battery Only

    Ground Shipping Only. No Priority Mail or Express Mail.

    Lower 48 States Only. No AK, HI, PR, AS, GU, MP, VI, MH, FM, PW. No APO/FPO/DPO - AA, AE, AP.

    No International Orders


    • 5,000 mAh capacity, charges phone 1 time
    • 2 in 1 – Power Bank + Battery Charger
    • 1458 mAh/oz, 29% lighter than Anker
    • 2-way 18W USB-C fast charging
    • Touch sensor power display


    The Nitecore® F21i Minimalist Power Bank is one of the lightest 5000 mAh USB-C power banks out there. 1458 mAh/oz and 29% lighter than Anker. This ultralight unit is a combination of a revolutionary Nitecore 21700 iSeries battery with the Nitecore F21i power bank adapter. Charge your phone or recharge the battery, with the same adapter. Perfect for shorter adventures or take along an extra battery for longer trips.

    The main body is made of lightweight, durable polycarbonate. The battery is securely held in place with an EPDM elastic band which is UV and ozone resistant. High performance, without all the extra weight.

    F21i supports 2-way 18W fast charging with Quick Charge QC, Power Delivery PD, and more protocols automatically detected. Multiple protection safeguards ensure safe and efficient charging.

    Tap the USB-C port to turn on the blue power level indicators. 3 dots for 100%, 2 dots 70%, and 1 dot 30%. During battery charging or USB output, a white indicator will turn on to indicate access of Fast Charging Mode if the external device is equipped with fast charging protocol.

    During charging, the blue indicators will flash to display the power level. When fully charged, all three blue indicators will be steady on.

    F21i is specifically designed to charge Nitecore iSeries batteries with dual polarities on both ends. It is NOT compatible with other batteries. DO NOT use with other batteries. Because the positive and negative terminals are close to one another, when storing an iSeries battery loose in your pack or pocket you must install the included battery end caps to avoid contact with metal objects that could cause arcing.



    Cell: Li-ion iSeries battery only

    Materials: Polycarbonate body, EPDM rubber strap

    Capacity: 5000 mAh, 3.6 V (18 Wh)

    Capacity Density: 1458 mAh/oz (51.4 mAh/g)

    Energy Density: 5248 mWh/oz (185 mWh/g)

    Input: USB-C, 5V-2A | 9V-2A


         Battery: 4.2V-4A max

         USB-C: 5V-2.4A | 9V-2A | 12V-1.5A

    Recharging Time

         Fast Charger: 2.5 hours approx., 18W-2A charger, USB-C to USB-C cable (charger not included), charges 80-90% in 90 min   


         Power Bank (DiaxL): ø1.08 x 4.43 in. (ø2.7 x 11.3 cm)

         Charging Cable: 6 in. (15.2 cm) long


         F21i + Battery: 3.43 oz (97.2 g)

         F21i only: 0.78 oz (22.1 g)

         Battery only: 2.65 oz (75.1 g)

         Battery End Caps: 0.12 oz (3.5 g) pair

         Charging Cable: 0.19 oz (5.4 g)

    Operating Temperature: 14 to 104°F (-10 to 40°C)

    Storage Temperature: -4 to 140°F (-20 to 60°C)

    Included  F21i + Battery

         1x F21i Adapter

         1x NL2150HPi Li-ion iSeries Battery, 5000 mAh

         2x Battery end caps 

         1x Charging Cable, USB-C to USB-C, 6 in. (15.2 cm) long

    Included – F21i only

         1x F21i Adapter

         1x Charging Cable, USB-C to USB-C, 6 in. (15.2 cm) long

    Included  Battery only

         1x NL2150HPi Li-ion iSeries Battery, 5000 mAh

         2x Battery end caps


    User Manual

    Nitecore F21i User Manual



    • Read the user manual carefully and completely before operating. Connect external devices only according to the specifications in the user manual.
    • Keep away from children to avoid injury.
    • DO NOT use if device is damaged to avoid fire or explosion.
    • DO NOT leave device unattended when operating. Stop using at any sign of malfunction.
    • Charge in or on a fire-proof surface to avoid possible injury. DO NOT charge unattended.
    • Charge only at temperatures between 32-113°F (0-45°C) to avoid permanent damage and possible fire or explosion during charging.
    • DO NOT use charging cables made or sold by unprofessional manufacturers or ones that are damaged.
    • Store in a ventilated area. Keep away from combustible materials to avoid fire.
    • DO NOT expose the device to open flames or extremely high ambient temperature to avoid possible fire or explosion.
    • Avoid any shock or impact of the device.
    • DO NOT place any conductive or metal object in the device to avoid short circuiting and explosion.
    • DO NOT disassemble or modify the device as this could result in battery explosion, cracking or leaking, causing personal injury, property damage and/or other unpredictable risks.
    • Recharge every 3 months when left unused for an extended period.
    • Recycle or dispose of properly according to local regulations at end of life, DO NOT dispose in fire or incinerator as battery may catch fire and explode.

    In no event shall Litesmith, LLC be liable for any direct, indirect, punitive, incidental, or special consequential damages, to property or life, whatsoever arising out of or connected with the use or misuse of its products.

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