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Thread: Marine Battery for Defender?

  1. #1
    Join Date
    Feb 2008
    Location
    Scarborough, QLD
    Posts
    3,257

    Marine Battery for Defender?

    I'm looking to replace my cranking battery and auxiliary battery. My current cranker is a 4yo Caterpillar battery, which is getting a bit tired. The auxiliary is a Century marine battery of the same age, and is buggered. Any reason why I shouldn't/should go another marine battery?

    Any other battery suggestions?
    1995 Defender 130 HCPU
    Trayon Camper
    1995 Defender 110 Wagon (now gone)

  2. #2
    Join Date
    May 2014
    Location
    Tamworth NSW
    Posts
    4,099
    I have 2x Optima 'Blue tops' in the group 34 size. Works for me. They are a hybrid style battery - a mix of deep cycle and cranking
    The blue tops are the same specs as the yellow top, just with additional threaded post terminals for additional accessories (above and beyond the SAE posts).
    -Mitch
    'El Burro' 2012 Defender 90.

  3. #3
    Join Date
    Mar 2008
    Location
    Kilmore, VIC
    Posts
    798
    I have the same in the D1 (2x blue tops). Seems to work a treat. The cranking battery is about a decade old and still working like a new one. The aux is only a couple of years old... so far.
    DiscoClax
    '94 D1 3dr Aegean Blue - 300ci stroker RV8, 4HP24 & Compushift, usual bar-work, various APT gear, 235/85 M/Ts, 3deg arms, Detroit lockers, $$$$, etc.
    '08 RRS TDV8 Rimini Red - Compomotives, 285/60 BFGs, Rock sliders, APT full under-protection, Mitch Hitch, Tradesman alloy rack, LLAMS, VCIQ

  4. #4
    Join Date
    Feb 2008
    Location
    Scarborough, QLD
    Posts
    3,257
    I decided to just replace my cranker with a Supercharge MF95D31R, and will drop a deep cycle AGM in as the auxiliary.
    1995 Defender 130 HCPU
    Trayon Camper
    1995 Defender 110 Wagon (now gone)

  5. #5
    Join Date
    Jan 1970
    Location
    Central West NSW
    Posts
    11,627
    Been using Blue Top for about the last 15 years - they're a great battery.

  6. #6
    Join Date
    Jan 1970
    Location
    Logan
    Posts
    19,857
    Quote Originally Posted by Ranga View Post
    I decided to just replace my cranker with a Supercharge MF95D31R, and will drop a deep cycle AGM in as the auxiliary.
    Good move. Starting and auxiliary batteries are different.
    Starters give a big charge to start and do very little else. They have thin walls. They recharge fast.
    Auxiliary batteries have thicker walls and are designed to give a slow discharge. They recharge more slowly.
    Using them for the wrong purpose damages them.
    2009 Defender 110 2.4. ARB bulbar, Ironman winch, Safari snorkel, Steinbauer chip, AP HD clutch, Lightforce spots, larger tank, Off Road Systems drawer, Traxide 160 controller, Tekonsha brakes, Mulgo seat runners, Uniden UHF, Nuggetstuff seat corners, breathers, Polaris GPS.

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