Originally Posted by btrayfors
positive to positive, negative to negative = parallel operation
that will double the amperage, same voltage
(assumes both are 12V batteries)
Battery Banks (series, parallel, or series/parallel) should always be configured so that Positive & Negative Line & Load Distribution Cables are connected to different batteries
at opposite ends of the combined bank.
Connect Positive to battery 'A', and Negative to battery 'B'.
When connecting the batteries in parallel, the positive poles are connected to each other, as are the negative poles. The voltage does not change and the capacity (Ah) will be the sum of the connected batteries.