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Non-BMW battery tender for trickle charging battery
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I have a Battery Tender brand trickle charger that charges two bikes at a time. I just bought a 2016 RS1200RS and notice in the owners manual that it says that if you charge your battery with a non-BMW brand charger that you must disconnect the battery from the bike while charging. I have a standard charger cable from my K1200RS that I want to attache to the terminals of the RS battery and wire tie the cable so that the connector end is accessible for easy connect to my Battery Tender trickle charger. Will this end up damaging the RS electronics (referring to the dire warning in the owners manual). My gut says it wouldn't be a problem, but the downside of doing damage to expensive electronics makes me proceed with caution. I tried a conversion cable that converts the BMW accessory plug to the same connector of my charger, but it would not recognize that the charger was connected. The dealer said that it had to be a proprietary BMW charger in order to charge through the existing accessories port on the right side near the seat. |
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Firstly, you do not need a BMW proprietary charger to charge via the accessory socket. There are some other branded chargers such as the Optimate 4 that are canbus compatible. |
Zitat von dsheets im Beitrag #1 1) Send $5.18 to Amazon https://www.amazon.com/Battery-Tender-08...t/dp/B000NCOKZQ 2) Mount $5.18 item to your battery 3) Connect to your BT whenever you want
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Zitat von dsheets im Beitrag #1 Dale, I have the same setup as you do. I mounted the Battery Tender to my garage door opener and the cables dangle down and stay off the floor. I previously had two non Can-Bus motorcycles that I kept connected whenever not in use. Batteries would last more than 5 years, guaranteed. Now, on my 2016 RS I connected a SAE pigtail to the battery on a permanent basis and did try a SAE to Can-Bus adapter for the right side port, but the Battery Tender is not Can-Bus compatible. It would not maintain a constant connection. So, I simply tucked and routed the lead up the tank to its center and into my tank bag from the front of the seat. I can maintain a constant regulated charge when not in use, and with a SAE to USB adapter (revzilla.com), keep my phone charged and protected from the weather while riding. The RS is almost a year old and I've not had battery related issues as BMW might suggest. Hope that helps.  Stick.
2016 Granite Gray R1200RS
Haymarket, Va. USA |
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Dale, I have an Optimate 4 intelligent charger. This is not the Can-bus version however Optimate do sell a Can-bus compatible version if you want to charge via the bike's aux socket. I have "permanently" attached the pigtail direct to the battery terminals, see pic, and attach the Optimate to it when in the garage. I also used this type of setup on my 2011 Can-bus RT for a number of years without issue. The owners manual for the RT also had the scary warnings you mentioned. I believe those warnings are only valid if you mess with, or connect via, the original wiring. Regards, Ray |
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Yesterday I installed a Shorai lithium battery in my RS, connected a pigtail directly to the battery and it is currently charging via a Optimate lithium battery charger. I am taking my RS to my dealer on Saturday for its 18K servicing and fork oil replacement. If my bike blows up, or I get whipped by my dealer for bypassing the Can'tBust system, I will be sure to let you know on Sunday.
Current motorcycle collection: 2002 Yamaha FZ1; 2005 Triumph Bonneville T-100; 2011 Royal Enfield Bullet 500; 2009 BMW F650GS; 2016 BMW R1200RS; 2011 Zero S 16.6 kWh
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Zitat von Richard230 im Beitrag #6 Your dealer may whip you but your bike and battery will still be fine  |
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Zitat von Ray im Beitrag #5 Indeed. I “messed” with the original wiring by tapping in to the aux plug feed to take an ignition source to my Fuzeblok box under the back seat. An older version of a BM Canbus Charger would not work properly. The connection simply timed out. Probably upset by the presence of my additional cable connected to socket. My non canbus charger is getting along just fine with a direct connection to the battery.
Carpe Diem!
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I use an Optimate, direct to pigtail on the battery. The pig tail was fitted by the dealer. Total mileage across 2 RS 22k miles no battery or electrical issues to date. (Oh why did I say that!) |
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Same here. Dealer wired the pigtail directly to the battery. Alles gut! |
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Wed Feb 02, 2022 1:44 pm (Last edited: Wed Feb 02, 2022 1:45 pm)
Zitat von Herman im Beitrag #11 Me too, however I have a lithium battery in my RS and use an Optimate designed to charge lithium batteries. The charger works perfectly, however the BMW charging system does a very good job keeping the battery fully charged and the Optimate rarely runs for more than a few minutes after arriving home and plugging the charger into the SAE pigtail.
Current motorcycle collection: 2002 Yamaha FZ1; 2020 KTM 390 Duke; 2011 Royal Enfield Bullet 500; 2009 BMW F650GS; 2016 BMW R1200RS; 2018 Zero S 16.6 kWh
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I have regular AGM (currently stock, not lithium). I’m using a ~15 year old battery tender plus on a two days a week cycle, simulating a ride.
backRoadS
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now: 2020 R1250RS
then: 2015 K1600GT, 1999 VFR800, 1994 VFR750 |
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Zitat von Richard230 im Beitrag #12 A question. I’ve heard some people say lithium ion has caused issues. I surmise that they likely used batteries NOT designed for a standard 12v charging system built into the vehicle. So, do you have to install something to ensure the lithium ion battery gets charged properly or do the good ones come designed to work with 12v vehicle electrical systems?
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Zitat von zer0netgain im Beitrag #14Zitat von Richard230 im Beitrag #12 a Lithium battery is more complex than the AGM and other lead-acid batteries. There is an electronic module inside the Li battery that regulates the charge so that it can cope with the normal fluctuations you get from the vehicle's charging system. What are these issues you mention? The main one I am aware of is poor performance in cold weather. I would not use one for this reason on my RS as it is ridden in winter and I do not want to leave my office and have to wait for the battery to "warm up" before I can ride home. Some people may have damaged the batteries by using the wrong type of charger. I have not looked into the technology involved apart from an awareness that there are chargers on the market advertised as suitable for Lithium. Most likely, a guess in other words, the problem is an older smart charger not able to detect the electronic module and trying to "recover" the battery using desulphate mode as it has not done a handshake with the battery. The same thing has happened to some bike ECUs, hence modern chargers like the Optimate 4 making it clear they will not enter desulphate mode unless there is no load on the battery i.e. no vulnerable electronics that will get upset when the high voltage pulses are whacked into a dead battery.
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