Directed Electronics 520T Back-Up Battery System

by Directed Electronics

Product Details

• Product Dimensions: 8.2 x 8 x 2 inches ; 1.2 pounds
• Shipping Weight: 2 pounds (View shipping rates and policies)
• Shipping: This item is also available for shipping to select countries outside the U.S.
• ASIN: B000CIY5NS
• Item model number: 520T
• Average Customer Review: 4.1 out of 5 stars  See all reviews (9 customer reviews)
• Amazon Best Sellers Rank: #1,036 in Electronics (See Top 100 in Electronics)
  • #15 in Automotive > Replacement Parts > Batteries & Accessories
• Date first available at Amazon.com: July 7, 2004

Product Description

Alarm battery backup and sensor system

Battery triggers alarm when vehicle's battery is disconnected

Customer Reviews

Most Helpful Customer Reviews

33 of 36 people found the following review helpful:

4.0 out of 5 stars A must have for serious alarm protection, December 23, 2007

By 

Roberto C. Magalhaes (Chicago Illinois) - See all my reviews
(REAL NAME)   

This review is from: Directed Electronics 520T Back-Up Battery System (Electronics)

Any alarm installer will tell you that the first thing a fairly proficient thief will do is to pop the trunk ( very easy to do once you put your mind to it) and pull the battery wire. That allows him to work comfortably in getting around the alarm without calling attention. Someone with a open trunk may even draw some sympathetic looks from bystanders.
Well, if you are investing hundreds of dollars in a effective alarm system, it is not very intelligent not to spend a few bucks and get a stand alone battery.This also allows you to have a second hidden siren ( I have two) that keeps blasting after the thief has pulled the battery wire.He will realize he is up against a professional job and will move on to an easier steal 90% of the time.
If you have a remote transmitter that will also mean the car owner is on its way.Here in Chicago where the second amendment blatantly ignored, and a law abiding citizen is prohibited from carrying a firearm for self defense, that means you will probably resort to throwing rocks at an armed criminal or wait for the police so that you can tell them how you lost your car after the thief is gone.
Anyway the only thing that keeps me from giving a 5 star rating is that the battery does not have any indicator or link that will let know how much charge it is holding.

6 of 7 people found the following review helpful:

4.0 out of 5 stars DE 520T, November 23, 2008

By 

J. Williams - See all my reviews
(REAL NAME)   

This review is from: Directed Electronics 520T Back-Up Battery System (Electronics)

This product is quality. I have been using it with my civic alarm for over 3 months now. I have had no issues thus far. Easy to hook up, quality product. The only confusing part is the power. When hooking up the wires your your alarm, you use the power wire from the battery. You do not join it with a separate power wire from the car. The alarm is powered by the car through the battery during normal operation. When the car power is lost, the battery continues to power the alarm module.

3 of 3 people found the following review helpful:

4.0 out of 5 stars Nice product but!, November 23, 2010

By 

Michael Adinolfi (SC, USA) - See all my reviews
(REAL NAME)   

Amazon Verified Purchase

This review is from: Directed Electronics 520T Back-Up Battery System (Electronics)

Nice product, very well built but quite a bit larger than I expected. Finding a spot under the dash may be an issue but I'll figure it out.