Check out:
VTX
Available in 20", 26", and 700.

The 317wh battery has a suggested 50 mile range.*
Available in 20", 26", and 700.

The 423wh battery has a suggested 65 mile range.*
Available in 20", 26", and 700.

The 555wh battery has a suggested 80 mile range.*  
Includes DS3 display.
Available in large wheel sizes including 26" and 700.

The 555wh battery has a suggested 80 mile range.*  
Includes DS3 display.
$36.00 w/rack bracket
$1799
$36.00 w/rack bracket
$2499
$2299
$2099
* Maximum range based on one battery charge, using assistance mode level 1, according to use in ideal conditions.
Distances will vary depending on road conditions, riding surface, cyclist weight and assistance required.
Configurations shown include downtube batteries which are the best option for most trikes.  Other configurations
with rack mounted batteries are available.  Additional information is available here:                 
BionX is the easiest and best way to electrify your ride!  BionX e-bike systems attach easily
to almost every size and style of trike to give you a boost of electric assist when and where
you need it.  The BionX system is powerful enough that you will be able to tackle any hill or
long distance with ease, yet light enough that your trike still feels like a trike.

You can install a BionX e-bike system on a trike you already ride and love or you can
purchase a brand new trike powered by BionX.