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Thread: Best choice for dual batteries?

  1. #1

    Best choice for dual batteries?

    What are the current best options for dual batteries?

    The Porsche replacement is std lead acid and 236 each from Stoddard.

    Thanks!
    Jim F.

    1969 911S
    member 1864

  2. #2
    member #1515
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    Top choice are Sonnenshein, (sp.)?
    David

    '73 S Targa #0830 2.7 MFI rebuilt to RS specs

  3. #3
    I just installed two Mazda Miata AGM batteries from battery mart.com in my 69. I used the 2 1/8” foam blocks that they were packed in to put behind them. It was the perfect size to put the batteries in the proper position for the tie down brackets. About a 1/2” foam piece fore and aft and they are rock solid.
    Do a search lots of thoughts on batteries.
    1969 911S
    1969 Datsun 2000...worth less, but more valuable

  4. #4
    Thanks that is helpful. I will check out Battery Mart...what year Miata....or they all the same?
    Jim F.

    1969 911S
    member 1864

  5. #5
    Up until 08 maybe. Just go for 95 and you’ll be good.
    1969 911S
    1969 Datsun 2000...worth less, but more valuable

  6. #6
    Thanks...I will check them out.
    Jim F.

    1969 911S
    member 1864

  7. #7
    member #1515
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    If you don't want the best the miata batteries come in second and are widely available in AGM. I've been using them for 4 years and keep them on a smart charger.
    David

    '73 S Targa #0830 2.7 MFI rebuilt to RS specs

  8. #8
    Serial old car rescuer Arne's Avatar
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    I also have the Miata batteries in my 72T. The fit is a bit on the tight side, but solid. The clearance to the positive terminal is small, so be certain to strap them down tightly, and maybe put a plastic or rubber cover on the positive cable end.
    - Arne
    Current - 2018 718 Cayman, Rhodium Silver, PDK

    Sold - 1972 911T coupe, Silver Metallic; 1984 911 Carrera coupe, Chiffon white; 1973 914 2.0, Saturn Yellow; 1984 944, Silver Metallic

  9. #9
    Senior Member
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    Original batteries had a black plus a white cover for positive located with two pegs that fit holes in top of OEM battery but often long ago these AWOL. Also these factory insulating pieces may need be different if now using other batteries.
    Last edited by 911MRP; 06-07-2020 at 05:18 PM.

  10. #10
    Senior Member zenithblue71T's Avatar
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    There are some marine batteries folks are using that fit perfectly.
    James Hurst #1638
    R Gruppe #514
    911T with 2.2S Ps and Cs, Solex grind Cams and PMO 40mm

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