Deka Replacement Battery for F800 ST? - BMW F800 Riders Forum & Registry



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  1. #1

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    Hi,

    My OEM Exide battery died and will not take a charge. I have less than 1000 miles on my bike, but was lax in getting it on the Battery Tender Plus in time for the winter. I have a local supplier that can sell me a Deka ETX14 for $85, but I am not familiar with the brand. I know of WestCo and Yuasa. Is this a comparable/good battery? Is this also the correct AGM replacement for an F800 ST?

    Lastly, on the F800, do you need to remove side fairing to remove the battery, or can you get it out ok just removing the seat and 'fake' tank cover?

    Thanks.

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  3. #2
    SunnY's Avatar
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    Thats a "real" tank cover, not a "fake" one.

    Never heard of Deka. Doesn't mean they are no good. No fairing removal required.

    .
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  4. #3
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    I understand that DEKA gets rebranded as H-D oem equipment.
    <intentionally left blank> 

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    N4HHE's Avatar
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    Unlike many other brands, Deka is a real battery manufacturer. As stated by others already, Deka manufacturers batteries for other brands as well.

    Deka is good stuff.

  7. #5

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    Thanks for the responses.

    Made the mistake of having my local dealer cross-reference the Deka part number to verify it was comparable/compatible as far as cca and Ah, only to be told that "if I install an aftermarket battery it will void the remaining year and a half on my electrical warranty".

    I find that to be crap. It is not like I am modifying the bike, and even BMW has to know that the OEM batteries are junk. But, fyi, the Deka ETX14 is a proper and compatible replacement part for the F800S and the F800ST.

  8. #6
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    Quote Originally Posted by tjmmav21 View Post
    Thanks for the responses.

    Made the mistake of having my local dealer cross-reference the Deka part number to verify it was comparable/compatible as far as cca and Ah, only to be told that "if I install an aftermarket battery it will void the remaining year and a half on my electrical warranty".

    I find that to be crap. It is not like I am modifying the bike, and even BMW has to know that the OEM batteries are junk. But, fyi, the Deka ETX14 is a proper and compatible replacement part for the F800S and the F800ST.
    Magnuson-Moss Warranty Act of 1975 places the burden on dealer and manufacturer to document that your use of non-OE replacement caused the damage. Exactly the same thing applies to selection of motor oil, you can not be bound to use only BMW oil to retain your warranty unless free BMW oil is provided for the duration of the warranty.

    Your dealer is telling falsehoods with respect to an aftermarket battery voiding your electrical warranty.

  9. #7
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    Quote Originally Posted by N4HHE View Post
    Magnuson-Moss Warranty Act of 1975 places the burden on dealer and manufacturer to document that your use of non-OE replacement caused the damage. Exactly the same thing applies to selection of motor oil, you can not be bound to use only BMW oil to retain your warranty unless free BMW oil is provided for the duration of the warranty.

    Your dealer is telling falsehoods with respect to an aftermarket battery voiding your electrical warranty.
    What N4HHE said is my understanding as well.

    However, your dealer should give you a new (apparently prone to failure) BMW/Exide battery under that same warranty that they claim will be voided by use of a (likely better) aftermarket battery. When my original battery failed, the repairing dealer told me that the battery itself had a 2 year warranty.

  10. #8
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    Had my first OEM Exide battery replaced after 10 months. The second has been playing up for a while with the dashboard rebooting after startup and cranking sounding decidedly ill. The replacement OEM Exide lasted about 2 years so I can't say that there was a problem with it but after reading this thread and checking out the cost of a replacement Exide I hunted for a Deka Power Sports AGM Battery and found the cheapest ETX14 online at Batteries Direct. At AU$143.20 plus AU$20 shipping from Sydney to Perth it was about AU$60 cheaper than buying accross the counter at Battery World in Perth. The Deka was delivered to my door 4 days after placing the online order. Can't comment on longevity or reliability but the Deka slipped straight in, cranking was very healthy and starting was within a few turns of the crank again.

    Like to share a good experience so have attached their website below.

    www.batteriesdirect.com.au

  11. #9
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    Deka would work for me. I've had one of their car batteries and didn't have any trouble out of it for several years.
    Brendan 

  12. #10
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    Quote Originally Posted by viper View Post
    The Deka was delivered to my door 4 days after placing the online order. Can't comment on longevity or reliability but the Deka slipped straight in, cranking was very healthy and starting was within a few turns of the crank again.
    Dekka is not Yuasa, but I believe the same applies. See item 4 on page 12 of Yuasa Tech Manual. Never mind the new battery happily started your bike, this initial low rate change serves to "break in" the battery.

    Item 6 on page 27 says the same thing. As does page 31.

    Several years ago someone from Yuasa launched an education campaign insisting that new batteries be charged for up to 6 hours before initial use. That otherwise failures as commonly cited here will occur and keep occurring. Have not been successful in finding documents tonight directly linking short battery life to improper "activation."

    Yes, the bike will charge the battery but the bike will not be kind. Yuasa states the initial activation charge current should be limited to 1/10th the battery's rated AH capacity.
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  13. #11
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    Make sure it will fit. I went with Yuasa because there was no jinking around required to get it in the space. In it went & never a problem since.
    “Do we behave reasonably well as a species? Or are we perhaps one of the mistaken evolutionary branches?" - Farley Mowat 

  14. #12
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    I'd just suck it up and snag a Yuasa or WestCo replacement. You know that it's going to fit and it's going to perform for years. The last thing (beyond a helmet) that I'd want to skimp on is a battery. If it fails, you're on the side of the road.
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  15. #13
    Nashville TN kismetcapitan is offline Volunteer Moderator - F800S/ST, S1000RR
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    think I'm going to have to get some kind of battery. 10ah...my old Aprilia 2T bikes had a 9ah battery to save weight and to manage very minimal electronics. I'm beginning to kill my battery with the twin 55watt HIDs I'm running (dash resets now), so that doesn't bode well for the heated grips I plan to install this winter...
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  16. #14
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    Quote Originally Posted by kismetcapitan View Post
    think I'm going to have to get some kind of battery. 10ah...my old Aprilia 2T bikes had a 9ah battery to save weight and to manage very minimal electronics. I'm beginning to kill my battery with the twin 55watt HIDs I'm running (dash resets now), so that doesn't bode well for the heated grips I plan to install this winter...
    If you are killing your current battery with electrical loads you will kill any battery. If the alternator can not source enough power to drive your loads then the battery only temporarily band-aids your "deficit financing" situation. No matter how large your bank account it will be depleted if you spend faster than you earn.
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  19. #17
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    Yes I know this is an old post but was looking for a battery replacement info for my 2016 F800GT.. FYI..pulled out my oem BMW battery and it was made by Deka in Lyon Station,Pa.

  20. #18
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    My suggestion is to find another battery of the proper size and not worry about the name brand. Batteries are commodity type items any more now. The name on the outside is different, but the insides are all pretty much the same. So I just look for the model number which seems to stay pretty much constant. Then I look for the most CCA (Cold Cranking Amps). Then I look at the price. High price does not equal more performance. Lastly, I look at customer reviews...especially the bottom rated reviews. You can quickly determine if the reviewer really knew what they were talking about and the battery or seller has issues...or if the buyer had issues and just doesn't want to take credit.

    I paid less than $50 for my last battery.

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  22. #19
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    Can’t go wrong with either Deka or Yuasa both made here in Pennsylvania..probably make most of the re-branded batteries on the market..

    Picture of my BMW 2016 F800GT oem battery made by Deka

    https://ibb.co/vhBrFs0

  23. #20
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    From the photo, I would say that only a very small part of that battery was made in Pennsylvania
    Probably glued it together and stuck on the lables and boxed it in PA.
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    So the dashboard rebooting after starting is not normal? Tnx in advance..

    The second has been playing up for a while with the dashboard rebooting after startup and cranking sounding decidedly ill.

  25. #22
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    This is my first gel battery. Hope I'm lucky! https://www.motorcycleparts-hornig.c...battery-2.html

  26. #23
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    Not sure how much difference it makes but the original battery is an AGM type not gel.The Exide AGM battery is this one:-

    https://www.ebay.co.uk/itm/EXIDE-AGM...72.m2749.l2649

    Article outlining the differences between gel and AGM:-

    https://www.batterystuff.com/kb/arti...el-vs-agm.html
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