01. Rechargeable 21700 battery of the “i” series 
      With a capacity of 5000mAh and a discharge current of 8A

02. The “I” series of 21700 batteries is a 
      Revolutionary and Powerful upgrade (Patent No. ZL201820118916.0, US Patent pending)
      – 21700i batteries are a patent product developed by NITECORE
      – Enable high efficiency power delivery by reducing internal resistance losses.
      – It has both positive and negative poles on each side, as well as high energy concentration
      – It is compatible with adaptive accessories of intelligent communication and control systems.

03. Excellent energy density
       21700i batteries have an energy density that reaches up to 240mWh/g
       11% more than 18650 batteries
  
        The energy capacity calculation formula is:
        Mass Energy Density = Battery Capacity x Battery Voltage / Total Battery Weight
        
        * The energy density of one 18650 Li-ion battery is: 216mWh/g (3500mAh, 3.7V)
        * Total weight of one NL2150i is 75.5g

04. Battery performance is unprecedented
      The dual polarity on both sides of the 21700i series batteries broke the principle of 
      connecting the head and the back switch so as to reduce the size and weight of the lens.
      Thus, the internal resistance is dramatically reduced to offer direct conversion of energy to
      supply the device. Due to the innovative techniques and technology our lenses have
      the ability to be designed with more possibilities.

05. Internal safety features
      – Innovative anode design with high temperature resistance
      – Pressure relief valve activates in case of rapid temperature rise
      – A built-in PTC circuit limits surges
      – Microporous guard protects sensitive internal components.

06. High-performance electronic protection circuit
      1. Automatically protects against over-charging, over-discharging and short-circuiting.
      2. It incorporates a high-quality integrated protection circuit
      3. It incorporates two very powerful MOSFETs in the current regulation unit for better performance and 
          excellent performance.

07. External safety features
      1. Fitted at both ends with nickel-plated steel strips to ensure impact resistance,
          good electrical contact and oxidation resistance.
      2. Coated with a durable metal film to protect against corrosion
      3. Durable plastic protector of the electronic circuit.

08. Low Cost and Environmentally Friendly
      By using Li-ion rechargeable batteries you save energy and reduce your
      carbon footprint on the planet.

09. Safety and reliability 
      Globally insured and approved with many international certificates.

10. Technical characteristics
      – Type: NL2150i
      – Capacity: 5000mAh
      – Voltage: 3.6V
      – Continuous discharge current: 8A Max
      – Weight approx: 75.5g
      – Total length: 76.7mm +/- 0.3mm
      – Diameter: 21 ,9mm +/- 0.3mm
      – Warranty period: 12 months from the date of purchase
 

PRECAUTIONS:
– Never expose the battery to fire or water
– When charging or using batteries, ensure that their positive and negative poles match the
  positive (+) and negative (-) symbols
– To extend battery life battery it is recommended to charge it every three months when it remains
  unused for long periods of time.
– Keep the battery away from children