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Anyone done it? What do you guys think would be a good second battery to install. And how?

I don't know if i want to charge only or use it as a spare for whatever reason without draining the main battery. Or just simply add some extra amps.

I"m toying with the idea of maybe just a motorcycle sized battery added to the main.

Now that i've finally got an actual screen and if i can figure out how to make it work. I might be watching movies at work. Or whatever.

Using that torque scan trying to download pids which apparently the app don't work. That was a 3 hour process right there. Enough to trigger the low battery alerts.
 

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I added a 1.5 farad capacitor and a 36aH deep cycle battery I got from Amazon to the trunk of my car. I wanted my auxiliary electronics on a completely separate and isolated switched circuit so it didn't screw with the sensitive equipment or computers in the car and I can turn it on and off at my leisure with a switch I mounted by my seat. I use it for my amp which powers some subwoofers and some extra 6x9s I put in the package tray. I also have my trailer lights and harness powered by it, and a 12v socket that is always on I can use to charge stuff when I'm away or power other things like coolers and lights and boomboxes etc.

I use an 80 amp isolator relay to charge the second circuit from the main battery as needed, but only when the switch is on. I use the same switch to control the remote input for the amp, and the lights for the sub box. An added bonus is if my main battery dies, I can jump myself off by flipping a switch, or at least charge the main battery at the rate of 80 amps. I'll add some pictures of the battery box in the trunk and the subs where you can also see the trailer wiring harness hanging from the grocery hook and the 12v socket sitting on top of the battery box. Pictures are not currently working at this time.

Wire Auto part Vehicle Bumper Technology
Tire Vehicle Automotive tire Trunk Vehicle door
Vehicle Car Trunk Mid-size car Family car
Vehicle Car Auto part
Light Automotive lighting Headlamp Vehicle audio Electronics
Vehicle Car Technology Auto part Electronic device
 
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Update: I added the pictures to my other post. You can click them to make them bigger.
 
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