Fitting second leisure battery. Advise please

[Monty don]

On my MH the leisure battery is in one of the internal bed boxes in a battery box.
If I want to fit a second one next to it is it just a question off

Get another battery get another box yellow plastic thing
Conect the two battery's together and the charger will do its stuff

Or am I missing something

Thanks
GB

 

[tonyidle]

No you have it correct. Use wiring the same thickness as connected to your existing battery. If the two are side by side you don't need extra fuses.

 

[Monty don]

OK thats good
I have a friend who is a bit handy on electrics and he did say he would make me a couple of leads and you can just connect the two batteries
Just wanted to confirm thats ok re the chargers etc
Thanks
GB

 

[Driventemple]

Not quite as simple as connecting the two together in parallel. The main supply leads should be to the positive of one and the negative of the second battery.

 

[Lenny HB]

Not quite as simple as connecting the two together in parallel. The main supply leads should be to the positive of one and the negative of the second battery.
View attachment 343570

In theory yes but doesn't really matter with just two batteries.

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[Campervan_man]

You need to check the power capacity of your mains charger. I had a Burstner and the 240V charger was designed to charge 1X 120A leisure battery not for instance 2 X 120A batteries. The fan on the 240V charger was whizzing around trying to charge the extra battery load. I fitted an intelligent Numax 20A 240V battery charger to boost the original 240V charger which couldn't cope.

 

[tonyidle]

Not quite as simple as connecting the two together in parallel. The main supply leads should be to the positive of one and the negative of the second battery.
View attachment 343570

Irrelevant with short leads and only two batteries. Unless using a high power inverter (which won't happen with standard wiring anyway) the batteries won't see an unbalanced current draw. I deliberately didn't mention all the complications that are introduced if the batteries are further apart, subjected to inverter loads etc, because all the OP wants to do is add a second battery adjacent to the first.

 

[Leakylunar]

I wanted two batteries but was told by Sargent I couldn’t as the ec325 only works upto 130ah/h!

 

[Dirtyhands]

Make sure the battery box is room sealed and vented outside the Motorhome.