Replacement battery for F800ST - BMW F800 Riders Forum & Registry



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  1. #1
    danomar's Avatar
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    I apologize for yet another battery post, but the most recent forum discussion I found is a few years old.

    I replaced my BMW battery 18 months ago with a Parts Unlimited (USA) RTX14-BS, a good quality 14ah AGM battery. Approximately one month ago, it barely started my F800ST, and last weekend the same thing happened. I took it to the shop where I bought it and it tested at the bottom of its load range. Needs new.

    I keep all my bikes on Optimate 4 chargers when not in use.

    The bike's original BMW battery lasted a bit more than five years. BMW batteries cost nearly USD $200 whereas the Parts Unlimited battery cost only $70. Is there something super special about the BMW battery to merit the doubled+ price?

    I have read about positive results with lithium batteries but am unwilling to pay for one and yet another charger—unless that is my only feasible choice.

    Can anyone recommend a currently available AGM battery that will last more than two years? I contacted Odyssey and it may be a year before they have one suitable for the F800.

    TIA
    My spoon is too big. 

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  3. #2
    bmwroadsterca's Avatar
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    Deka ETX14 is popular with F800 riders.

    Sent from my SM-T813 using Tapatalk

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  5. #3
    N4HHE's Avatar
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    LiFePO4 batteries will start to have troubles when temperatures fall below 50°, and lots of trouble at 40°. If ever it is allowed to fully discharge (gotta keep the clock running, right?) the battery will be destroyed.

    LiFEPO4 batteries have about twice the CCA of comparable size AGM but 25% of the amp-hour capacity. You get a few chances to start the engine and if those fail you have to find help.
    2016 Yamaha FJR1300A; 2016 Beta 430RS; 2007 BMW F800S; 2009 Husaberg FE450; 2016 Subaru Outback; 2018 F150; 2013 Tesla Model S 85; 1983 Porsche 928S; 9 cats 

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  7. #4
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    Quote Originally Posted by danomar View Post
    I apologize for yet another battery post, but the most recent forum discussion I found is a few years old.

    I replaced my BMW battery 18 months ago with a Parts Unlimited (USA) RTX14-BS, a good quality 14ah AGM battery. Approximately one month ago, it barely started my F800ST, and last weekend the same thing happened. I took it to the shop where I bought it and it tested at the bottom of its load range. Needs new.

    I keep all my bikes on Optimate 4 chargers when not in use.

    The bike's original BMW battery lasted a bit more than five years. BMW batteries cost nearly USD $200 whereas the Parts Unlimited battery cost only $70. Is there something super special about the BMW battery to merit the doubled+ price?

    I have read about positive results with lithium batteries but am unwilling to pay for one and yet another charger—unless that is my only feasible choice.

    Can anyone recommend a currently available AGM battery that will last more than two years? I contacted Odyssey and it may be a year before they have one suitable for the F800.

    TIA

    Are you sure the charging system on your bike is working well? If the RR or worse, the stator, are not charging the battery it'll be draining as you ride (usually killing a cell, making the battery defunct).
    A battery charger will show the battery as full/charged as it can't see the internal damage and is unaware it won't hold voltage when drawing high current - such as starting the engine.
    BMW F800ST, 2010, Black, Fuzeblock, Sat Nav, BMW Tank Bag, Givi Touring Screen, Denali Spotlights, Denali CANSmart, Wunderlich Crash Bars, 62K Miles & counting 

  8. #5
    FrankV's Avatar
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    MotoBatt. Check their website for the right model.

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  9. #6
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    Not sure if the battery space on an ST is the same as a GT (I assume it is), but the Motobatt battery I bought was just slightly larger than the OEM one. No big deal but did reqire some minor battery lead re-routing, and the top panel of the faux tank doesn't fit as well as it used to. Sits a little proud where it curves down over the front of the battery.

  10. #7
    ccramerusc's Avatar
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    I bought a Duracell Ultra AGM about 6 months and 7k miles ago from Batteries Plus which comes with a 2 year free replacement warranty. Works great. Much better than a wet battery. I use a battery tender Jr (.75 amp), but only if I don't ride it for a few weeks which only happens in winter.

    https://www.batteriesplus.com/produc.../2008/cyl10001


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  11. #8
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    Quote Originally Posted by DJ123 View Post
    Are you sure the charging system on your bike is working well? If the RR or worse, the stator, are not charging the battery it'll be draining as you ride (usually killing a cell, making the battery defunct).
    A battery charger will show the battery as full/charged as it can't see the internal damage and is unaware it won't hold voltage when drawing high current - such as starting the engine.
    Agree

    I'm using Batterysharks.com F800ST-GS-09_M12-10-180-D BMW 800CC F800ST, GS, 2009
    It was; $22.99 Tax: $0.00 Shipping: $10.95
    '08 F800ST Low 

  12. #9
    redhededgreg's Avatar
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    I’ve had good luck with Scorpion batteries from batterystuff.com Quick, free shipping by usps priority mail in the US. https://www.batterystuff.com/batteri...800st-gs-gt-r/
    "The reason i do it is because if you get it wrong it'll kill you. If you think it's too dangerous then go home and cut your grass and leave us to it." Guy Martin
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  13. #10
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    Quote Originally Posted by Kukopia View Post
    Agree

    I'm using Batterysharks.com F800ST-GS-09_M12-10-180-D BMW 800CC F800ST, GS, 2009
    It was; $22.99 Tax: $0.00 Shipping: $10.95
    I'm using one of these as well, and no problems since.

    For me, the actual root cause was a burnt stator. Reg/rec looked fine (stable-ish voltage, never went above 14.4 V anywhere in the rev range, only problem was it hovered around 12.4 V and eventually went down to the mid 10 V range after 45 mins of commuting).

    Swapped out the reg/rec, and everything works great.

  14. #11
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    My battery died around when covid made it out of China.

    I had a Shido Lithium battery on my previous bike which I liked.

    I found that sellers usually won't send Lithium beyond the nearest pond, and it wasn't possible to hop abroad for a supply run.

    Unable to get my Lithium juice on, I went an ordered a Chinese Lithium battery in my grief -
    https://www.aliexpress.com/item/33022941096.html

    KP14-BS. Dreading to put it in, it was laying around for a month or more. Couldn't get any other source of LJ though. ebay sellers would cancel the shipping after realizing the address is outside the EU etc.

    Eventually I went on and put it in. That was around a year ago.


    Recently I put a phone charger that shows battery voltage, which allows monitoring a little more comfortably.

    If I were to order now, I'd probably just low-cost hop to the nearest country with Amazon and get a Shido LTX-14BS -
    https://www.amazon.de/-/en/SHIDO-LTX...dp/B00KMSBIZQ/

    (Especially since the KP14-BS is 130$ now, was 105$ IIRC when I ordered).

    In regard to cold weather / battery discharge - really depends on your use case and risk model.
    If someone lives in a cold place and rides every day, perhaps lead is better,
    I'm comfortable with lithium since I don't have to worry about babying it if if happens that I don't ride for a few weeks (like now..)
    As far as complete discharge - if you lock the handlebar overnight, and your aux electronics are connected to a switched source, I don't see how the battery gets discharged completely, even if the bike is standing unridden for months.

  15. #12
    N4HHE's Avatar
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    Quote Originally Posted by kaz View Post
    As far as complete discharge - if you lock the handlebar overnight, and your aux electronics are connected to a switched source, I don't see how the battery gets discharged completely, even if the bike is standing unridden for months.
    Put your DVM in ammeter inline with your battery with your "locked handlebar" and you will learn how and why a battery will fully discharge if left unridden.
    2016 Yamaha FJR1300A; 2016 Beta 430RS; 2007 BMW F800S; 2009 Husaberg FE450; 2016 Subaru Outback; 2018 F150; 2013 Tesla Model S 85; 1983 Porsche 928S; 9 cats 

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