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Battery Disconnect switch with vertical swing.

Availability: Usually ships the same business day

K-switch-vert  List price: US$31.76  Sale price: US$18.00  

  • Top mount: opens vertically.
  • This switch must be mounted to the grounded side of the battery. This is usually the negative post.
  • Easy to reach and operate.
  • With 5/8" diam. post for receiving standard battery cable clamp.
  • Carries 250 amps continuous and a maximum surge of 750 amps.
  • 3" wide x 4" long x 2" high.
  • Requires at least three inches of vertical clearance from the top of the battery post for the switch to operate.
  • Requires two 1/2 inch wrenches to install.


This switch can be used on battery with a top mounted negative post with 5/8" diameter (standard negative top post on american cars SAE [Society of Automotive Engineers] standard) providing there is room for it. It will not fit on the Optima battery in a 2004 to 2009 Prius because it there is not enough room for it.

The picture above is with a Miata battery installed in a 2001 Prius. The original battery in 2001 to 2010 Prius automobiles has Japanese standard posts and this switch will not connect to them.

This switch is a must for any car with a security system that is left unattended long enough to significantly drain the battery. For the 2001 to 2003 Prius if you regularly park the car for a week or more you should get this switch. A major cause of battery failure is deep discharge and on the 2001 to 2003 Prius even leaving the car undriven for only a week on a regular basis can cause premature battery failure.

Basically it depends on the Ampere Hour rating of you battery and the drain caused by your security system, clocks, etc. times the number of hours you will be leaving your car unattended. A 2001-2003 Prius (remote sensor, clock, and security system) draws approximately .0325 amps * 24 (hours in a day) * 7 (days a week) = 5.46 Amp Hours a week. So after two weeks you car has draw 10.92 which is over a 30% draw. This shortens the life of a battery. We recommend that you disconnect the battery any time you will leave you car parked for over a week with the Miata Battery. The Optima has significantly more capacity and it is chemically configured to handle deep discharges so it can be left connected. However after 4 weeks it is also totally drained and the battery can handle at most 200 such incidents so if you are going to leave the car sit for a month you should still disconnect the Optima battery. You just have to do it with a wrench because this switch will not fit.



knife switch mounted in a 2001 Prius
Knife Switch mounted in a 2001 Prius. Mounted in the Prius you can turn the switch on and off with out removing the cover just by inserting your hand inside the cover from the back of the switch. (see arrow)


Availability: Usually ships the same business day

Battery Disconnect switch with vertical swing. K-switch-vert  List price: US$31.76  Sale price: US$18.00  

We usually ship your order the same day if entered by 4:30 PM. Los Angeles time Monday to Friday.   We have special shipping rates available for International orders. See our full shipping policy. International Air Mail takes about 5 to 15 days to most countries.
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