My friend has a Python 990 or something similar, can you add a backup battery to a pre-existing installed alarm? He doesnt have a account so i'm asking for him obviously. Simple plug n play?

 

depends on the alarm. Most aftermarket alarms will have a battery backup port.

 

Cool so im assuming id just plug it in the brain and be set?

 

You would need to buy the dei 520t and follow the instructions. Its very detailed. Any alarm you can add a back up battery too.

 

Ok cool, the 520t has been purchased, once i receive it im sure ill have more ?'s

 

yeah, i got the 520t backup for $11 on eBay brand new.

I just had best buy put it in for $30. After you install it you need to drive around a bit for it to fully charge. If not, it will drain your battery and cause the alarm to go off.

It does take quite a bit of juice. I made a slow charge thing using a 12v bulb to slowly charge my capacitor for my system so it doesn't spark everytime I hook up the battery back up, and after installing the backup battery it takes forever to charge both of those so i just let it spark.