Add a 2nd Battery to your RV Travel Trailer 

You will find that one battery will charge and the other won't with the way you have the wires from the RV. The negative wire should be on one battery and the positive wire on the other battery, that way you will get an even and consistent charge across both batteries. I know from experience.

In order to balance the draw on the batteries the positive should come off one battery and the negative off the other battery. Nice install

The battery box that came with our RV was never bolted down... but side note you should drill an extra hole or two in the bottom to allow any water to run out

God lord man. Oriellys or Mexican zone would have the wires...

You'll love having that extra capacity. I've done dual 6v batteries wired in series in the past. Folks used to claim that two 6's lasted longer but I don't know if that's the case any longer. I only have one battery on my current RV and will upgrade to two before I plan any long stays. Yeah, that wire may have been overkill but better than making it too thin!

Good concept but how many people really have the large cutters and the crimping tool. I'm thinking very few. There has to be premade kits out there.

So that's how you install another battery ! Simple ! Thank you !

These cables are pure overkill in comparison to your output wires :D

Thank you very much for this top quality video: so well explained, the video filming, the tools used, each step well presented. It is a delight watching and learning how to do this. Thanks a million! I learned a lot!

That is a sizable set of wire cutters that you keep on you at all times! Good informative video!

I'm concerned that the bolt heads would rub a hole in the bottom of the battery.

Thank you so much for your video. Last year I took the two batteries off my trailer for the winter. I forgot how they were connected. So your video helped me out.

I had a chat with a person who said that overtime one battery will age differently to the other and that they would need to be some kind of battery management system wouldn’t this be true? Admittedly I have wired up my car batteries the same way you have and it’s been okay over the years, but I just wondered whether the, life of the batteries can be extended with some simple emphasis on simple battery management system. Thanks in advance.

Short, sweet and to the point. great video!

Are you using regular car batteries? I'm going to install a 2nd battery in my truck with a solar panel but can't decide if I want a golf cart battery with no cranking amps or a car battery with cranking amps "as backup" if my truck battery dies. I'm primarily going to use the 2nd one for camping accessories. I might need to hook them both up to the solar panel now that I think about it. My car battery was dead one morning because I ran some night vision cameras on it while camping.

This is exactly the information that I was looking for… Well done. Thank you very very much.

Positive on one battery from trailer and ground to other battery.... you will wear out battery that they are both hooked to first... plus they will charge more evenly....

Currently using a single battery w/ a 100 watt solar plan. If I need a second battery will both batteries charge off the solar plan?

Quick question, did you install any solar to your RV roof? would be interesting to see thanks

At the start you said you would connect them.in parallel did I miss something

What happen if one battery V is lower than other when connecting them together

is there any place to just buy the cords alread assembled like that? i dont ahve a haet gun, or crimper.. appreciate the video, its way easier than i was thinking!

So there is no need to upsize wires from batter to RV even if you had a 300ah battery?

Can I do different lithium’s battery’s but same amps?

these batteries will be subject to the elements, if you are crimping connections ALWAYS use de-ox in the wire and terminal to prevent corrosion. alSO. INSTALL THE BATTERY BOXES WITH THE CABLE ENTRYWAYS FACING TO THE REAR TO LESSEN THE AMOUNT OF WATER AND ROAD SPOOGE THAT GETS IN.

I especially appreciated the comment about no need to connect negative to opposite battery since the parallel wires are beefy. Most videos are adamant to do that but my cable don't reach anyways. Thank you!!

Looks like no space to hold 4 batteries 😢

Thank you for video. I have an inverter and 2 lead acid batteries. Bought a portable unit. We are currently pin against the steering wheel. I need to remove the current system. Move our seat back. What do you recommend doing please if you could help me, I would really appreciate it?

Can you have two 12V batteries that are not the same brand/Ah?

😮niceeee..well done I’m so confident I can do it to..

Why it’s I try to install and they sparks like crazy?

Don't forget to disconnect the original battery charge it up to 100%. Do the same for the second battery and then install.

Hooking up my batteries for the first time on a new RV. Connected positive from camper to positive on battery 1, then negative from camper to battery 2. Next I connected positive on battery 1 to positive on battery 2. Then when connecting the negative on battery 1 to negative on battery 2 there were a bunch of sparks. Any thoughts on what I might be doing wrong? Should I have connected positive on battery 1 to positive on battery 2 prior to connecting negative from the camper to battery 2? Appreciate your thoughts.

i did this prior tyo seeing this video the only thing i wish i would have done is ran two 6 volt battery's in series you actually get more amp hours that way but im gonna try the 2 12v for the year and see how it does i also have one 200w solar panel on the roof of my camper 2022 jayco jayflight slx8

If something got left on overnight do both batteries go flat ?

Sir, living in mountainous, overcast northwest PA, I was considering inverter batteries I could recharger with my Wgen 9500DF in order to save on my LP which I plan to be connected to the generator very soon. I did something similar during my year in Haiti but recharged off the hotels electricity when they (hotel) turn the electric power on from 6pm to 11pm. Yes, only 3-4 hours each day unless there were bad storms or hurricanes. Besides staying cool, I also needed power to run/charge necessary electronics for work and run WiFi. My woodland cottage is small with sell, septic, oven (hardly ever use), fridge, forced air heat (LP), freezer, WiFi and flat screen. The Wgen9500DF was hooked up professionally and already put to good use in last freezing 3 hour outage. Reviewed your Wgen review and the inverter batteries as backup really caught my interest. As a pensioner, no way can I afford solar panels. Thanks! Great videos BTW!

Go wing nuts for quick detachment.

Thanks for the video! Im purchasing a used RV, and would like to and a second battery. The current battery on it is a couple years old. If i buy the exact same battery, and match the voltage on both is there any jssue with using one older and one new battery?

Hey! you mentioned the batteries are charging near the end, what is charging them?

Exposed cables

nice

Awesome

A pair of scissors and a crimp mill it just might work faster

Crimp is an inadequate connection.

If your 1/0 is overkill, my 3/0 must be waaaay overkill lol

Ok so u can add extra batteries what if ur on electric grid i know it charges batteries will it over charge an start blowing stuff

2 - 6 volt batteries in series will give you more amp hour capacity than 2 12volt in parallel, but very nice job! no need to move the negative either.

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