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Battery Disconnects 101

One of the most common questions we field is,  “Which battery disconnect do I need?” In order to determine that, you need to know how you intended to use it. There are two main purposes:

  1. Disconnect the battery when storing the vehicle. This convenience allows you to store the vehicle for an extended period of time without worry of the battery running flat due to parasitic draw of the accessories . ECUs, BCMs, PCMs, radios, clocks, etc. all draw a very small amount of current with the vehicle sitting to retain settings or data.
  2. Pass tech at your local track. The NHRA and most other sanctioning bodies mandate a Battery Disconnect Switch that is clearly labeled and externally accessible for any vehicle with a battery that has been relocated to the rear of the vehicle. This affords the safety crew the ability to shut off a running engine and disconnect power to the vehicle’s accessories in the event of a crash, rollover, etc.

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