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Thread: D2a TD5 Auto Cranking Battery

  1. #1
    Join Date
    Jul 2014
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    PERTH, WA
    Posts
    338

    D2a TD5 Auto Cranking Battery

    I am going to need a a new cranking battery (v-e-r-y!) soon.
    On this forum, I've seen Optima batteries mentioned many times over the years, and would like to know which variant is most applicable as a cranking battery.
    As far as I can glean, it seems that all Optima batteries are of AGM type.
    Is that correct?

    Is an AGM battery actually suitable for the main engine-starting application?

    Would welcome any comments or advice on this!

    Cheers,
    Andrew

  2. #2
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    Jan 2014
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    if you don't want to re-invent the wheel just put in the biggest good quality battery you can afford/get.
    I've noted on this forum the CAT branded battery are quite popular.
    Regards
    Daz


  3. #3
    Join Date
    Apr 2016
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    Melbourne
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    3,802
    Quote Originally Posted by AndrewMilne View Post
    I am going to need a a new cranking battery (v-e-r-y!) soon.
    On this forum, I've seen Optima batteries mentioned many times over the years, and would like to know which variant is most applicable as a cranking battery.
    As far as I can glean, it seems that all Optima batteries are of AGM type.
    Is that correct?

    Is an AGM battery actually suitable for the main engine-starting application?

    Would welcome any comments or advice on this!

    Cheers,
    Andrew
    Yep, Optima are AGM, the D2 charges them fine.
    On the TD5, I've changed the single large N70ZZ battery type, to twin N70 sized batteries, one main and one aux battery.
    Redtop for the main, yellow top(deep cycle) for the aux.
    The Optima redtop has no issues cranking the TD5. Very easily and speedily. Has done so from new, and even still does considering it's half dead now.
    Yellow top has been more durable than the redtop on the TD5.
    IIRC they're about 4 or 5 years old now.
    The TD5 is the brothers car, but I do 99.9% of the work on it, so it sometimes sits in my yard(sometimes weeks) while we wait for stuff, or time, or whatever.
    One time, maybe a bit over a year ago, it sat for about 2 weeks, no charge(my bad) and when I got the chance to fix whatever it needed, the battery was totally dead(about 11 volts on it).

    Since then, it's always lost charge if not topped up or driven. Hold charge for about a week(maybe 4 days).. but something in that range.
    Yellow top on the other hand, is more OK. That I've seen so far, even in the two week period that half killed the redtop, the yellow held charge better(up at 12.1v).
    I fitted a redarc VSRm and with that I've incorporated the easy push to jump start feature, but the redtop was so dead, all it did was drain the yellow top(ie. not enough to crank the TD5) .. so disconnected the redtop, jumper cable from the yellowtop, and vroom! ..

    You wouldn't have issues starting if using a yellow top.

    But! even tho technically the redtop is down to 60% SOH, and doesn't hold charge for any length of time(ie. 4+ days) ... in those 4 days it cranks the TD5 like it's a new battery! Really weird. Then on the 5th or more days(I think it depends on ambient temps maybe) .. it's dead.
    Arthur.

    '99 D1 300Tdi Auto
    '03 D2 Td5 Auto

  4. #4
    Join Date
    Jan 1970
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    Central West NSW
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    13,097
    Iíve always run the Blue Top D31M which is a 75ah. Very happy with this setup. It also has a fair bit more capacity that the Red Tops which are 50ah. This one can be used for starting or deep cycle although I tend to not deep cycle from it and use it mainly for just starting. Being a marine battery it also has additional terminals on the battery which are really handy!
    Cheers
    Slunnie


    ~ Discovery II Td5 ~ Discovery 3dr V8 ~ Series IIa 6cyl ute ~ Series II V8 ute ~

  5. #5
    Join Date
    Jan 2011
    Location
    Gippsland
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    1,432

    D2a TD5 Auto Cranking Battery

    Quote Originally Posted by DazzaTD5 View Post
    if you don't want to re-invent the wheel just put in the biggest good quality battery you can afford/get.
    I've noted on this forum the CAT branded battery are quite popular.
    CAT - the best money I have ever spent on a battery. Came with a 7 year pro rata warranty and I got a 1000CCA so itís never Ďstressedí ANDÖ.. it is the same physical size as the standard 650CCA battery it replaced so no mods required to house it.

    It was installed on 27 August 2012 - so in 55 days itíll clock up 10 years continuous service to be then retired to the shed to work out its life giving a solar panel a purpose and powering the shed light.
    LROCV member #131
    1999 build D2 TD5 Auto, Mantec snorkel, 2" LRA spring lift, ARB on board air, Ashcroft ATB, CMM air ram CDL shifter, swag & gold pans ....

  6. #6
    Join Date
    Jan 1970
    Location
    Perth WA 6149
    Posts
    1,308
    Iíve had a good run out of Delkor batteries.

    When I bought my D2a it had one fitted. Replaced it last year, 9 years after I bought the car. Not a bad run so I fitted another Delkor.

    Which reminds me, itís time for a 10 year update.

    Cheers
    Steve
    12 - 1994 Jaguar XJ12 "Lady Penelope"
    6 - 1986 Alfa Romeo GTV6 Grand Prix
    5 - 2003 Discovery 2 S Td5 "Charlie"


  7. #7
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    west of Transylvania
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    Quote Originally Posted by AK83 View Post
    Yep, Optima are AGM, the D2 charges them fine.
    Maybe the D2 charges AGM "fine" but not well IMHO... AFAIK AGM batteries need higher(around 14,8) and more constant voltage for charge than the D2's alternator was designed for cos it was conceived for lead acid battery and works between 13.8 and 14.4V depending on the battery status... i'm with @DazzaTD5 on this, get a reliable and powerfull lead acid battery with long warranty and get done with it

    i
    100% sustain this explanation: https://workshoppist.com/car-alternator-charge-agm-battery/
    Discovery Td5 (2000), manual, tuned

  8. #8
    Join Date
    Jan 1970
    Location
    Melbourne, AU
    Posts
    666
    My 2c worth... I didn't have a great experience with CAT. Less than 2 year old battery started losing charge. RACV gave me a test report which showed the degraded performance which I took to CAT.
    CAT tested and said it's fine and refused to honour warranty.
    I had an Exide from Costco ($130ish) as my auxiliary battery which I put in as the starter - smaller size than the standard D2 one and didn't expect it to be more than an interim but several years later it's still going strong.
    Go figure
    _________________________
    Discovery 2 2002 Td5 ES Auto - SLS lift, chipped, CDL, de-EGR, Traxide USI160 DBS
    Discovery 4 2013 SDV6 HSE Auto - Llams, Traxide SC80LR DBS
    Nanocom Evolution with codes for both above vehicles.

  9. #9
    Join Date
    Oct 2020
    Location
    Elizabeth North SA
    Posts
    292
    Has anyone had any experience with the 1000CCA from this crowd ?

    4WD Batteries Archives - Superstart Batteries

    Not promoting I am after feedback if any.

  10. #10
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    west of Transylvania
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    Quote Originally Posted by johnp38 View Post
    Has anyone had any experience with the 1000CCA from this crowd ?

    4WD Batteries Archives - Superstart Batteries

    Not promoting I am after feedback if any.
    You need a minimum 110AH battery, the high CCA is not enough on it's own
    Discovery Td5 (2000), manual, tuned

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