Dual Batteries
If adding a 2nd battery does it need to be identical to the 1st battery?
Forum Discussion
14 Replies
- It shouldn't matter what batteries you use if you just run an isolator between them.
- I had one of my conventional group 24 batteries that kept corroding badly and quickly .
I replaced it with an agm .
I am a detail guy .
I wash my trailer after every outing .
It drove me nuts having to clean that battery so frequently .
So I went AGM .
A year later I got another to match . - Lowsuv - Just curious - for my own learning curve. If you say that 2 6v batteries in series is the best solution, why did you go with exide edge agm 12 volt?
Lowsuv wrote:
NO
they do not have to be identical .
IT IS BEST to be identical .
Before you flame me I was an industrial electrician before becoming a lumber company owner .
it is agreed on this forum that 2 6 volt batteries in series is the best solution .
I make the argument that AGM batteries , typically 12 volt in parallel are the next best solution .
I further make the argument that an exide edge agm battery is compatible in charge rate as a conventional battery .
I ran a conventional battery in parallel with my new upgrade edge AGM battery until I got an identical AGM battery to be its mate .
I had no issues .
I paid $ 140 each for my exide edge agm batteries at BiMart .
They charge faster , do not corrode , have a 4 year guaranty , typically last 7 to 11 years , and are made in the USA .
Over time I converted to edge AGM in my TT , Boat , duramax , Porsche , and Mercedes ( agm standard , I just replaced with edge AGM group 49 ).- I use a group 24 and a group 72 battery connected in parralel because thats whats fits on the tongue of my TT. Both are deep cycles. If I could I would have 2 group 72s.
Never had an issue. pianotuna wrote:
Hi,
Best practise is that they be identical. Wiring matters.
This is what is balanced and best for twin twelve volt batteries.
What Pianotuna says!- Hi,
Best practise is that they be identical. Wiring matters.
This is what is balanced and best for twin twelve volt batteries. - The batteries should be of the same make, type, and size. Since the OP's battery is new, that covers the same age rule.
- We camp without hookups , mostly .
If I only had one battery , I would consider buying the second battery and case in the largest amp-hour capacity that would fit .
If I had one group 24 and only had space for an additional battery in group 27 size I would go that route .
As my Dad said "There is no substitute for cubic inches " .
That applies to batteries just like a 454 vs a 396 . - NO
they do not have to be identical .
IT IS BEST to be identical .
Before you flame me I was an industrial electrician before becoming a lumber company owner .
it is agreed on this forum that 2 6 volt batteries in series is the best solution .
I make the argument that AGM batteries , typically 12 volt in parallel are the next best solution .
I further make the argument that an exide edge agm battery is compatible in charge rate as a conventional battery .
I ran a conventional battery in parallel with my new upgrade edge AGM battery until I got an identical AGM battery to be its mate .
I had no issues .
I paid $ 140 each for my exide edge agm batteries at BiMart .
They charge faster , do not corrode , have a 4 year guaranty , typically last 7 to 11 years , and are made in the USA .
Over time I converted to edge AGM in my TT , Boat , duramax , Porsche , and Mercedes ( agm standard , I just replaced with edge AGM group 49 ).
