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    Efficient Battery Size Converter Cylindrical Battery Case Easily Switching 18650 Cells to Fit 21700 Device Requirements Size Converter

    $6.49

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    About this item

  • Craft from and metal, for long time use
  • Convert your existing 18650 battery into the larger 21700 size
  • for use in a variety of electronic devices such as high powered flashlights and portable mobile power
  • 18650 to 21700 battery conversion cylinder, a practical for upgrading your power sources without the need for new batteries
  • Essential accessory for your travel energy needs