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Thread: Motorbike battery - max charge rate vs alternator output

  1. #1
    p38arover's Avatar
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    Motorbike battery - max charge rate vs alternator output

    Now something to exercise those little grey cells.

    I need yet another battery for my 2007 Yamaha XJR1300. I don't ride it enough and it looks like the CTek XS0.8 charger that is usually connected might have boiled the battery dry. So I looked up the specs for the XTZ14S AGM battery used in the XJR and noted it has a normal charge rate of 1A and a max charge rate of 3A. The XJR alternator can output 28A which seems, at first glance, to be a little high!

    On a fresh battery, it probably wouldn't be an issue as the battery would be fully charged quickly - but what about an older battery?

    This may be all rhetorical as I don't have much choice but to buy a new battery but your inputs/thoughts would be interesting.
    Ron B.
    VK2OTC

    2004 L322 Range Rover Vogue 4.4 V8 Auto
    Yamaha XJR1300
    Previous: 1983, 1986 RRC; 1995, 1996 P38A; 1995 Disco1; 1984 V8 County 110; Series IIA



    RIP Bucko - Riding on Forever

  2. #2
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    Cannot help you on battery selection but I too suspected I cooked a battery leaving the charger on 24/7.....

    For my camper trailer I had it on a 7 day timer charging for one 24hr period per 7 days.....I than moved to a small solar panel where it trickle charged each day giving the batteries a rest at night.

    2000 110 Hardtop

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    Hi Ron and weed’s suggestion of a solar panel is the simples and safest way to look after infrequently used batteries.

    Jaycar and Altronics use to have a regulatered, small milli-amp solar panels.

    These would be perfect for your situation.

  4. #4
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    I use a Projecta Battery maintainer on my bike over those bad months ,
    It puts out roughly 200 milli amps
    Does a brilliant job and never a issue
    cheers chris


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  5. #5
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    I put a motobatt agm in my bike 6 years ago and apart from the occasional charge it's holding up well.
    MY08 TDV6 SE D3- permagrin ooh yeah !
    98 TDI AUTO SE DISCO - gone and will be missed.
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  6. #6
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    Quote Originally Posted by loanrangie View Post
    I put a motobatt agm in my bike 6 years ago and apart from the occasional charge it's holding up well.
    x2...good battery
    1973 SIII 88"
    1986 Isuzu 110 County
    '79 Bonnie/'06 Sprint

  7. #7
    p38arover's Avatar
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    Quote Originally Posted by loanrangie View Post
    I put a motobatt agm in my bike 6 years ago and apart from the occasional charge it's holding up well.
    Better than mine. This will be the 4th (or 5th) battery in 10 years.
    Ron B.
    VK2OTC

    2004 L322 Range Rover Vogue 4.4 V8 Auto
    Yamaha XJR1300
    Previous: 1983, 1986 RRC; 1995, 1996 P38A; 1995 Disco1; 1984 V8 County 110; Series IIA



    RIP Bucko - Riding on Forever

  8. #8
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    Quote Originally Posted by Gordie View Post
    x2...good battery
    Um x3
    cheers chris


    My Toy 04 D2a Td5 Manual With Lots of Goodie Goodness
    S111 Swb a work in progress

    Two Wheel Fun Factor
    Triumph Sprint St 955i
    Bultaco Tss 250
    Moto Guzzi 650

  9. #9
    p38arover's Avatar
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    I just had a look on evilbay for a Motobatt YTZ14S equivalent and several suppliers are advertising "new & refurbished" batteries.

    What the heck is a refurbished battery? One that has been cleaned?

    I'm a bit leery of buying from any of them!
    Ron B.
    VK2OTC

    2004 L322 Range Rover Vogue 4.4 V8 Auto
    Yamaha XJR1300
    Previous: 1983, 1986 RRC; 1995, 1996 P38A; 1995 Disco1; 1984 V8 County 110; Series IIA



    RIP Bucko - Riding on Forever

  10. #10
    goingbush's Avatar
    goingbush is offline TopicToaster Silver Subscriber
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    interesting discussion.

    I have a Century PS12180 12v 18Ah SLA motorbike battery in my Electric Landy as part of the ADR/ NCOP14 rule that states the Hazard lights need to work for 30 min in the event of a main traction battery fail.

    All the 12v electrics are hooked up to it . Lights / Horn / Wipers etc
    It also provides 12V to energise the Kilovac 2000amp contactors for the main traction pack.


    When the car is powered on a 50amp DC-DC converter keeps the battery charged at 13.8 Volt


    I wonder how long this little battery is going to live given that according to the Century website the safe charging rate of a Lead Acid is 10% of its Ah rating, which in my case would be 1.8Amp ????
    May account for the huge fail rate of Tesla 12 SLA batteries, which serve exactly the same purpose.

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