You might want to read about some problems I and another local Hymotion
owner have had with the Hymotion interaction with the Prius auxiliary
battery
<http://www.roperld.com/Science/Prius/priushymotionconversion.htm#AuxBat\
tery> . Hymotion has been informed of the problem; we are waiting for a
fix.
Dave Roper
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