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Thread: Sizing Deep cycle - 2nd battery

  1. #1
    Join Date
    Apr 2013

    Default Sizing Deep cycle - 2nd battery

    I've just picked up a '78 Westy. The previous owner put a regular battery in for a 2nd battery. He said he thought it should be a deep-cycle battery, but he never got around to putting one in. I think the battery is about dead...reads only 10.5 V after being plugged in the night before.

    I'm trying to get the proper battery installed. I went to a local autoparts store (Pep Boys). The smallest deep cycle battery would not physically fit on the left side of the engine compartment.
    So my questions -

    -I assume if I do find one that fits - that it is ok to put a deep cycle battery here, with a regular battery hooked up on the right side.

    -What size battery will fit here?

    I have searched the archives -but can't seem to find this answer. I assume this is a pretty straight forward issue-that must have been addresses before, but I couldn't find it.

    Thanks for any tips...

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  3. #2
    Join Date
    Jan 2005
    Boise, ID


    I found a very good video on Utube about adding a deep cycle battery in a '88 Westy. The well under the driver seat will not allow any of the normal deep cycle batteries used for fishing, campers etc.
    They used 3 d.c. 12v batteries made to run electric wheel chairs, wired in parallel. They are 22 amp-hour batteries, 66 a.h when connected. Added feature: he put a battery tender in the 120v shore power circuit to charge the setup whenever it was connected to outside power.


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