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Yeah, the litefuse kit you linked to is $141 on amazon. Lithium battery monitoring systems may be a well understood subject matter, but if the price / economics don't make sense, they are of little use for us motorcyclists. And when the entire battery costs ~$200 (for a high end ballistic nonetheless, cheaper lithium batteries are available), a $141 BMS makes zero sense.
Amazon.com: Cole Hersee 48513-02-BX LVD Kit with Harness & Rocker Switch: Automotive