dei 520t battery, can it be changed out?

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Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=102805
Printed Date: May 15, 2025 at 6:48 AM

Topic: dei 520t battery, can it be changed out?

Posted By: nightides
Subject: dei 520t battery, can it be changed out?
Date Posted: March 05, 2008 at 1:01 PM

Trying to rig a backup battery for a GPS tracking unit. Was told to get the 520t which I did. Unit only has .7Ah of reserve/backup power.

Can a 12V home alarm backup battery with more amp hours be use instead..?? I would still use the control module of the 520t just with a 4-7 Ah 12V battery. If the answer is no, why might that be be case..? Has anybody done it before with good or bad results..? What would be the downside of setting things up this way.?

Thanks for your input

Replies:

Posted By: chriswallace187
Date Posted: March 05, 2008 at 10:41 PM

I've never done it - however there's not really any reason you couldn't, provided the 520T's battery is 12V (I've never metered one and I know an alarm will typically run on lower voltage, hence the caution).

I'd suggest the first thing you should do is measure the current draw from your GPS unit if you haven't yet - it may be low enough that it's not worth the trouble of the battery swap.

-------------
C Renner's Auto Electronix
My service is cheap, quick, and good - pick any two

Posted By: nightides
Date Posted: March 06, 2008 at 1:12 AM

Thanks for you comment.

I did measure the voltage of the 520 right out of the package and it was 12.1 volts. So that is okay. I then use my GPS unit's 'current draw' figure and determined in my application the 520 would only last 2 hours.

My view is that it would really be stupid to be only backed up for 2 hours. After that the GPS would stop transmitting and I will have nothing. A 2.8 Ah battery would give me about 9 hours of backup. Well worth the cost of $20.

Has anybody used the larger battery..?