Flexible Lithium Polymer Batteryjflex

Technologies with new form factors, wearables, and future devices cannot be achieved with traditonal batteries. J.Flex, an innovative flexbile battery by Jenax, meets these challenges by freeing design limitations without sacrificing power.


  • Gel polymer electrolyte
  • Rapid movement of lithium ion
  • No overheating
  • High energy density
  • Low internal resistance
  • Stable even with bending fatigue



J.Flex can be bent or rolled to enhance the flexibility of next generation devices. From IT to healthcare and fashion, J.Flex supports a range of industries that are using advanced technologies to add new design, comfort, and efficiency to their devices.

The test below tracks the charge and discharge performance of batteries in two different states:

1. Non-bending

2. Dynamic bending (10,000 bends from flat to 20mm in radius)
flex1 flex2 graph1


design Creative designs are often hindered due to lack of components that support the designer’s vision for the product. With J.Flex, a new level of customization is possible. A designer can now use new shapes and sizes not otherwise possible without minimizing performance. This brings out the design’s full potential, and enables entirely new types of devices that are more functional, discreet, and streamlined.


J.Flex ensures outstanding performance for any device. The tests below are based on a J.Flex cell with the following specifications:
Category Contents
Type Li-ion Polymer
Dimension 27x48mm
Nominal Voltage 3.8V
Capacity 30mAh<@0.1C
Operation Temp. -20 ~ 60℃
Cycle 80%@1.0C/1,000cycle
Standard Current Charge 1.0C CC/CV to 4.25V, 0.1C cutoff
Discharge 0.2C to 3.0V
Max Current Charge 1.0C(30mA)
Discharge 2.0C(60mA)
  • High Rate Cycle (1.0c Charge & Discharge)graph2
  • Charging Rategraph3
  • Discharge Rategraph4


J.Flex is in compliance with international standards to ensure safety for all applications.

Electrical Abuse Test

  • Short Circuit Test At 55±5˚C, with a 100mΩ until 20% decrease from the highest temp. Pass
  • Over Charge Test DC 10V (20±5˚C)
    1. charge current: 1C
    2. charge time > 2.5 hrs Pass
  • Over Discharge Test 1C discharge for 90 min Pass
  • Over Current Test 4.2V CC/CV charge with max.
    3C (20±5˚C) Pass

Environmental Abuse Test

  • High Temperature Test Storage 70±2˚C for 7 hrs Pass
  • Low Pressure Test Storage at 11.6KPa for 6 hrs Pass
  • Heating Test Increase 5±2˚C/min till 130±2˚C and keep 130±2˚C for 10 min Pass

Mechanical Abuse Test

  • Impact Test Drop 9.1±0.1Kg weight at a height of 61±2.5cm from the cells Pass
  • Drop Test Drop cells on to hardwood from 1m height 3 times (20±5˚C) Pass
  • Nail Penetration Test Penetration of fully charged battery pack
    1. nail radius = 3mm
    2. penetration rate = 80mm/sec Pass


The uses for J.Flex are limitless. From current wearable applications that span diverse industries to unforeseen future technologies, J.Flex can fully realize next generation creative design.
IT Wearables
  • Smart Watch
  • Smart Glasses
  • Headset
  • Fitness Band
  • Medical Device
  • Smart Apparel
  • Accessories
  • Footwear
  • GPS Tracker
  • Military Helmet
  • Wearable Robot
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