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Directed 520T

12 Volt Backup Battery and Sensor

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List price $59.99

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$26.99

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  • 12 Volt Backup Battery System
  • Powers siren when battery is disabled
  • 1-year SonicElectronix.com warranty

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Sonic Electronix

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
80%
4 Star
20%
3 Star
0%
2 Star
0%
1 Star
0%

Average Attribution Rating

Durability
4.8
Value
4.6
Features
4.8
Design
4.4
Usability
5.0
mike

staten island

Overall
Durability
Value
Features
Design
Usability
The DEI 520T battery back up is Good you have to know how it works

August 5, 2011

The DEI 520T battery back up is Good you have to know how it works I have installed over 200 of them in the past year with all car alarms code-Alarm and VIPER the best alarms to use is the DEI VIPER alarms as there is no feedback on the remote start wires like code-Alarms the only thing I don't like is DEI recommend only the alarm unit itself only on the Gray wire of the 520t this unit will only put out 15 to 20MA max after that it will drop the output below 12v on the Gray wire power output wire for the alarm and drop the output power on the red battery wire this is why the 12v batter back up will go dead after any ware from 1 to 3 mounts any accessories like 509u 508d or the DEI tilt sensor and dei relays is over the current limitations of DEI.

SOLUTION to this problem I have found that you run a fuse wire from the car battery to the Red back up battery this will be your solution to this the back up battery and the Gray wire will match the output power of the car battery and when the car is running will max out at 13.9 to 14.5v also you can now upgrade from the BS 12v .08AMP battery to a 12v 1.5AMP or even an alarm battery 12v 4.5AMP the car battery will charge it.

39 of 46 found this helpful

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James

Newberg, OR

Overall
Durability
Value
Features
Design
Usability
so far so good

December 23, 2011

Installed and seems to work fine. Messes with virtual tach on the Clifford 50.7x. Had to hard wire in the tach as it was not sensing the car was started. Other than that everything seems to be great. It was easy to install. Make sure you use diodes on the triggers when sharing common trigger inputs. Thanks again Sonic. Another great purchase.

37 of 44 found this helpful

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Alen

Bosnia and Herzegovina

Overall
Durability
Value
Features
Design
Usability
Good buy

December 28, 2009

This is a really good optional accessory for the Directed made car alarm system. I recommend this product.

31 of 38 found this helpful

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Jake

Baton Rouge, LA

Overall
Durability
Value
Features
Design
Usability
Good investment

January 17, 2009

If you have a DEI alarm you need this add-on. If a thieve wanted to make your alarm useless, all he needs to do is disconnect your battery. This add-on makes this impossible. If your battery is disconnected the alarm still work and also will be triggered.

32 of 40 found this helpful

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Josh

Indiana

Verified Purchase
Overall
Durability
Value
Features
Design
Usability
Reliable Backup Battery

November 18, 2015

This was a breeze to install in my first DIY car alarm install. The instructions provided with this backup battery are very simple. Just tap into a constant 12v wire and feed it into this unit.

0 of 0 found this helpful

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Browse 2 questions and 2 answers
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Why did you choose this?
Sonic Electronix Store
What's an alarm w/out a battery backup!
Donald E on Nov 20, 2014
are there universal?
A shopper on Jul 13, 2015
Best Answer: yes works awesome for brain only
Reply · Report · joe g on Jan 10, 2016
· Add Answer · I Have This Question Too (0)

Product Summary

Manufacturer

Model Number

520T

UPC

093207005206

Weight

0.50lbs

Internal SKU

dei-520t

Internal Product ID

5369

Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Directed 520T