How to Combine 6 Batteries
Updated 08/07/2025 | Published 07/15/2025
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Question:
Which terminals do you hookup to when charging 6 6volt batteries in series/ parallel with a battery charger.
asked by: Russell M
Expert Reply:
Hey Russell. I attached a diagram below that will show you how to wire batteries in series and in parallel. Batteries in series are wired negative to positive. Batteries in parallel are wired positive to positive and negative to negative.
Depending on what voltage and amp hours you're looking for, there are a few ways to wire your 6 batteries.
To get the 12V output that most RVs use, you'll want to wire the first two batteries in a series configuration and the rest in a parallel configuration. You can take a look at the included picture as a reference.
The first two would have one positive connected to the other's negative. The remaining positive and negative would be connected to the second pair's same sign or positive to positive and negative to negative. That second pair would connect to the third pair like that as well (+ to + and - to -). The third pair would have the positive connected to the 12V and the negative to the ground.
In this way, you would get 12V and increased amp hours. I recommend the NOCO Genius Smart Charger, item # 329-GENIUS10. It has multi-stage charging to charge faster.
What are you installing these batteries in?
(click to enlarge)
Product Page this Question was Asked From
NOCO GENPRO On-Board Battery Charger - AC to DC - Waterproof - 2 Bank - 12V - 20 Amp
- Battery Charger
- Battery Charger
- Boat
- Electric Vehicle
- Generator
- Trolling Motor
- 12V
- Charges and Maintains
- AGM
- Gel
- Lead Acid
- Lithium
- Shore Power to Auxiliary Battery
- Smart Charge
- Trickle Charge
- NOCO
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Jerred H.
8/7/2025
Hey Russell, did the diagram and explanation help you set up your 6-volt batteries in series or parallel? I'm curious to know how it worked out for you, as it might help others trying to do the same thing!