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Video I did of my dual battery setup if anyone is interested.

I am upgrading to the Elite SXS battery box used in the video to get a bit larger battery. I am pulling more amps than the current extra battery can handle and have added a tone of extra electrical devices. The box you are using is priced well and will support a regular sized battery. Thanks for your post!
 

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There is a factory "key on" connection already there, it is right on the front of the steering column and capped off. You can get a premade harness like this one here...
I believe it is limited to 10 amps and shared with the cig lighter so you would need a relay for anything more than that...

View attachment 635
The one I bought for my x is a plug into factory switched connection with relay but is a fused 30 amp bar. Like 65 dollars on amazon
Wow, Elite Side-by-Side Engineering paired the battery box with their Talon shift plate for the same price and took 15% off the price. Dropped the price for both items to $55.25.
Playing stereo in my talon in garage while working on wifes rzr. Maybe like 2 hours of pretty loud music and walked over to start it and not enough power left in battery.. watching and reading this forum.. thinking I definitely have to go to a second battery.. or not play stereo when talon is off. Wifes battery is much bigger in rzr under seat.. seams honda could have put a bigger battery in for us.. not much bigger than the battery on my rincon 4 wheeler..
 

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I also built my own battery holder (but for a rather different reason). I am not a fan of putting a battery in the direct path of the hot air off the radiator (heat KILLS batteries) and I also added a storage box so I built an insulated firewall (all the way from the hood down the tunnel to the pseudo skid plate) and put the battery. isolator and all the wiring behind that. The battery is on the right just next to the glove box. There is just enough room for a Group U1 (35 Amp Hour) battery. I used a small fuse/relay box and put it in the glove box for easy access. All accessories are relayed to come on with the key and stay on for 15 minutes after the key is turned off and I have an on/off override switch (AKA Retained Accessory Power like in a car) so I don't have to have the key on and don't accidently leave anything on for more than 15 minutes (I am getting old :)). It runs everything I added except the S&B Particle Separator (I elected to leave that on the main battery)...
Where did you source the fuse block with timed relay?
View attachment 634
 
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