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  1. #1
    Join Date
    Jul 2019
    Posts
    1

    Default Should I battery modify or just get a new battery and see what happens?

    2004 Launch 21 direct drive.

    I got a new battery two years ago and it’s now toast. Should I add a deep cycle as well as the starter battery?

  2. #2
    Join Date
    Jul 2007
    Location
    Flowery Branch Georgia
    Posts
    2,742

    Default

    If you have a big sound system it would be a good idea. Use a Battery Isolator to keep both charged and draw off the deep cycle to run the sound system.

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