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Boomerweps's avatar
Boomerweps
Explorer
May 08, 2018

Connecting a second 12VDC battery

How is the second battery electrically connected?
Just paralleled? Do you add a disconnect for each for quicker charging one at a time?
Thinking another battery would be better for boondocking.

22 Replies

  • Boomerweps wrote:
    How is the second battery electrically connected?
    Just paralleled? Do you add a disconnect for each for quicker charging one at a time?
    Thinking another battery would be better for boondocking.


    Connect dual 12 volt batteries like this ...



    ... BUT it's not advised to connect batteries in parallel at all if your current one is several years old as it's characteristics will have changed sufficiently that it will draw down the new one and allow neither to charge properly. If your current battery is relatively new then I would do it but only if the second new battery was the same make / size as the original. However, all this raises the more important question - do you have a charger suitable for properly charging 2 deep cycle batteries? :@