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Range Extender Kit for Duo Series

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This sleek external battery is a secondary battery on the Juggernaut Duo series bikes along with the Juggernaut FS Pro 2. Use this battery if you want to ride even further than you can with just the internal hidden battery! A high-quality design and many power options provide reliable power and range to extend your ride!

Note: This battery has 3 different case heights - the larger 17Ah and 21Ah models may not fit smaller Step-Over frame sizes. Consult the pictures here for battery height and notes below for frame size compatibility.


  • Juggernaut Hub Duo
  • Juggernaut Classic Duo
    • 2022 Model Year Step-Over bikes only compatible with 52V13Ah & 52V14Ah Batteries
  • Juggernaut HD Duo
  • Juggernaut Ultra Duo 1, 2 and 3
    • 52V19Ah & 52V21Ah Batteries Incompatible with 17" Step-Over Frames
  • Juggernaut Ultra FS Pro 2
    • All frames compatible with 52V13Ah & 52V14Ah Range Extender
    • Only XL 20" Frame compatible with 52V16Ah & 52V17Ah Range Extender
  • Juggernaut Ultra Eagle
    • 52V19Ah & 52V21Ah Batteries only compatible with Large Size Frame


Note: If you have a Juggernaut Duo Series bike you will need a Range Extender plate to connect your battery to the bike - consult this guide if you need help determining which type is on your bike!

Wondering about the brand options and what to pick between Top Brand and OEM/Sinowatt? Take a look at this FAQ for some information!