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Thread: "Battery Tender" questions

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  1. #1
    Kbiker BCKRider's Avatar
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    "Battery Tender" questions

    I seem to remember that if you use a "Battery Tender" that plugging it in to a winter stored bike for a couple days a month is just as good as leaving it continually plugged in. The only current draw on my bike is the clock. Any comments? (Mine is a Battery Tender Junior.)

    Last year I used the adapter that let me plug the BTJ into the BMW receptacles and it worked perfectly. This fall I did the same, and after three days saw the same solid red light. Finally read the instructions on the charger and "solid red" means "you are not charging the battery." Hmmm. The fuze is good. It would seem that either the connecting cable or the internal wiring of the BMW plug has a fault, but both seem improbable. Any ideas, or exactly how to check?

    I DID solve the charging problem by using the little "alligator" connections on the positive battery pole and the ground bolt, both on the left side of the bike.

    My electric jacket wiring is now directly connected to the battery so guess I haven't used the BMW sockets for awhile.
    Doug
    1992 K100RS

  2. #2
    Ed Kilner #176066
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    R1200RT came with pigtail

    My new bike came with a dealer installed pigtail connected to the battery with an SAE connector to accommodate a battery tender unit. I did not request this and only found out about it when I took a pigtail in with me at the 1000 km service. When I asked them to attach it, they showed me their standard item already installed.

    I have the Sr unit that has a storage mode - Jr probably does too. Just leave it connected all winter.
    Ed
    2011 R1200RT Thunder Gray Metallic; 2000 Triumph 900(sold)
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  3. #3
    Swamp Fox GeneT's Avatar
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    Battery Tender Question

    Quote Originally Posted by BMW Triumphant View Post
    My new bike came with a dealer installed pigtail connected to the battery with an SAE connector to accommodate a battery tender unit. I did not request this and only found out about it when I took a pigtail in with me at the 1000 km service. When I asked them to attach it, they showed me their standard item already installed.

    I have the Sr unit that has a storage mode - Jr probably does too. Just leave it connected all winter.
    I dug this quote from an old post regarding late model bikes with on board computers and it sort of answers my question regarding battery tenders. It appears here that the selling dealer has connected a pig tail directly to the battery whereas allowing the owner use a more conventional battery tender as opposed to spending $166.95 for BMW's battery tender like my son in law bought for his GS.

    In order for this to work properly the ignition key must be on when it is plugged in, afterwards the key can be turned off and the BMW battery tender will now talk to the computer and battery.

    I know the owners manual says to disconnect the battery when connecting a battery charger to the battery to prevent damaging the electronics. However 12 volts is 12 volts, it does not matter where it comes from, so please can anyone explain how this type of connection can damage the electronics.

    I have had several cars which were full of electronics and jump starting or charging was never an issue. In view of the BMW dealer making this connection the owners manual appears to be designed to sell BMW battery tenders.

    What are your thoughts on this, I am not happy buying a 166.95 charger for my 2008 R1200 RT when I have three regular battery tenders here that work.

    Thanks
    Gene T

  4. #4
    Alps Adventurer GlobalRider's Avatar
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    Quote Originally Posted by GeneT View Post
    However 12 volts is 12 volts, it does not matter where it comes from, so please can anyone explain how this type of connection can damage the electronics.
    Actually low 14s.

    The only way that battery voltage can increase is by applying a higher charge voltage to it.

    Furthermore, any sensitive electronics if it is properly designed would have filtering and over-voltage protection.

    Attach the charge harness to the battery directly and stop worrying. Cripes, your alternator produces far worse voltage to the battery and your electronics is just fine...thanks to that big capacitor called a battery.

    Gotta love the scare tactics used.
    Last edited by GlobalRider; 08-10-2012 at 04:23 AM. Reason: typo

  5. #5
    Swamp Fox GeneT's Avatar
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    Battery Tender

    Thanks Global Rider, since I posted this I found another member that has made this same connection with out any problem.
    Gene T

  6. #6
    Registered User AKsuited's Avatar
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    Quote Originally Posted by BCKRIDER View Post
    Last year I used the adapter that let me plug the BTJ into the BMW receptacles and it worked perfectly. This fall I did the same, and after three days saw the same solid red light. Finally read the instructions on the charger and "solid red" means "you are not charging the battery." Hmmm. The fuze is good. It would seem that either the connecting cable or the internal wiring of the BMW plug has a fault, but both seem improbable. Any ideas, or exactly how to check?
    Okay, just to cover all the bases, you are connecting to the BMW socket first, and then plugging in the charger? It won't charge if you don't hook it up in the correct order.

    Harry
    2003 R1150RT - Silver

  7. #7
    Pjk Peter_Krynicki's Avatar
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    FWIW I doubt that the junior does as good a job as its bigger brother. I've plugged a bike into a junior until it goes green and the bike still wouldn't start, hardly turning over. Then plugged in the bigger one and after going to green the bike turned over strongly and started.
    Pjk

    When God created roads, He painted an invisible line of perfection. Then He created Ducati motorcycles to follow it.

  8. #8
    Benchwrenching PGlaves's Avatar
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    Quote Originally Posted by 75571 View Post
    FWIW I doubt that the junior does as good a job as its bigger brother. I've plugged a bike into a junior until it goes green and the bike still wouldn't start, hardly turning over. Then plugged in the bigger one and after going to green the bike turned over strongly and started.
    As I type I have 6 bikes plugged into BT Junior chargers. I have never had an issue with them keeping a battery charged if the battery was in decent condition.

    If the battery is OK but in a very discharged state it will take time because the amperage output isn't very high but I've not had an issue with them as maintenance chargers.

    Mine are all on outlets on a single switch so I can conveniently turn them off or on. They can stay on all the time, but 24 hours every 3 weeks or so is fine unless your bike has a lot of parasitic drain. Then 24 hours every couple of weeks out to do it.
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
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  9. #9
    Kbiker BCKRider's Avatar
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    Quote Originally Posted by AKsuited View Post
    Okay, just to cover all the bases, you are connecting to the BMW socket first, and then plugging in the charger? It won't charge if you don't hook it up in the correct order.

    Harry
    Yes, I plug into the bike first before plugging the charger into the extension cord. Since I was able to work around it and don't really need the BMW outlets, guess I simply won't worry about whether the final bit of cord from the BT or the internal wiring is bad, though if anybody can tell me how to check...

    Thanks, Paul, for the advice on frequency of charging stored bikes.
    Doug
    1992 K100RS

  10. #10
    Benchwrenching PGlaves's Avatar
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    I want to add a comment to what I wrote earlier. It seems that Odyssey says that their batteries required a much higher amperage to "charge" a discharged battery than most other battery types available for motorcycles. For wet lead acid the rule of thumb is to not use a charger with an amp output higher than 10% of the amp/hour rating of the battery. So for most of our batteries not over two amps. The same seems true for most VRLA (valve regulated lead acid) batteries of the AGM and Gel variety used in BMWs.

    Odyssey talks in terms of 6 to 8 amps to "charge" a discharged battery, and I've read that they have said 1 or 2 amps won't do it.

    So, a Tender, or Tender Jr. will keep it charged more or less, but won't really bring it back if you draw an Odyssey way down. It takes a bigger charger in this case.
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://www.bigbend.net/users/glaves

  11. #11
    Jack Herbst
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    I want to add that keeping a wet lead acid battery plugged into a battery tender will dissapate the fluid and dry the battery out over a period of time. I have experianced this many times on my collector bikes. I am not sure of the effect of leaving a Battery Tender connected for long periods of time with a sealed gellcell or glass battery. I never leave a Battery tender hooked up for more than 24 hrs because of this. I have also ruined large batteries in airplanes and motorhomes because of this. You must monitor the acid level frequently and not let it dissapate if it is a wet battery.
    A small amout of boiling always takes place when charging hence the acid/fluid depletion.

    Just installed a new Odyssey 680-P in my RT. What a difference in starting. The Odyssey has 225CCA (cold cranking amps) compared with about 125 on the OEM. Was not a perfect fit but added about 1/3 inch foam under the mounting strap (only) and it fits perfectly.

    I will have to look into the remark Paul made about the higher amp charging on the Odyssey for a deep charge.

    Jack
    "All my life I wanted to be somebody. Now I realize I should have been more specific."

  12. #12
    R1100 RT
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    Bringing an Odyssey 680 back to life

    I have Odyssey 680s in a 1998 R1100 RT and 2005 K 1200 LT. I have a Deltran Tender Junior and Tender Plus. If your Odyssey battery falls below 6.5 volts, you will need a bigger charge than what the Tenders will give you. Some places recommend connecting a parallel battery and then charging. I found that charging with a 10 amp charger for a cycle worked well. After bringing the battery above the 6.5 volt reading the Tenders work well. The Tenders should give you volt readings above 12 volts after they go into float mode.

    I use the Tender Junior on the RT once a month for 24 hours and leave the Tender Plus plugged into the LT. The LT will drain the battery. I have have liked the ownership experiences I have had with Odyssey batteries.

    Dean Kohlmeyer
    Garner, IA
    1998 R1100 RT Over 103,000 miles
    2005 K1200 LT

  13. #13
    Registered User lionheart33's Avatar
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    I have a Jr. When I use it the pattern is always the same, regardless of how long I have ridden or conditions in my garage. I get a blinking green for a few minutes and then a solid green. When I start my bike up after using it there is no difference than on the occasions when I don't use it. I ride year round and rarely go more than a week without riding. I replaced the original battery with an Odessy. I wonder if the Tender Jr. is actually doing anything.

    Will a long enough ride result in a fully charged battery?

  14. #14
    Alps Adventurer GlobalRider's Avatar
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    Quote Originally Posted by lionheart33 View Post
    Will a long enough ride result in a fully charged battery?
    It will IF the voltage regulator within the alternator is picked/set correctly by the manufacturer.

    Battery life also depends on the charging system of your vehicle, not just the battery charger/maintained while it is parked.

  15. #15
    Registered User
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    I have Odyssey batteries in all three of my motorcycles. I have been riding my 04 Roadster the most, and as such I let my two Kawi Cruisers sit,[my bad] and the batteries went dead. Plugged them in to a B/Tender for about 24 hours each, and both started effortlessly.

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