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Battery tender hook up leads

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johndeeredr

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Joined
Sep 7, 2024
Messages
156
Location
madera ca
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Bike
R1800B
Good morning all ! My question is instead of going through the pain of removing the battery just to hook up my battery tender harness., there is an adapter plug next to the reverse lever on my 2022 R1800B . Amazon has a plug with the harness and connector that will work with my battery tender left over from my Harley. Can I use that port to use my tender to keep the battery charged ?
 
johndeeredr said:
Good morning all ! My question is instead of going through the pain of removing the battery just to hook up my battery tender harness., there is an adapter plug next to the reverse lever on my 2022 R1800B . Amazon has a plug with the harness and connector that will work with my battery tender left over from my Harley. Can I use that port to use my tender to keep the battery charged ?
Click to expand...
Yes
 
Also to follow up . How do you remove the Battery ? Seems like it gets hung up on something near the positive battery cable ? I tried to rock it and twist it but can only get it about halfway .
 
  • Pull out the battery until the negative battery cable is accessible.
  • Loosen the negative battery cable. (Completely disconnect the Ground Cable)
  • Pull out the battery until the positive battery cable is accessible.
  • Loosen the positive battery cable.
  • Pull out the battery completely.
 
I did that procedure up too the point were the battery gets stuck halfway out and it feels like I’m pulling on wire, or cables. Around the positive connector of the battery . What could be the problem and anything else I can do ?
 
johndeeredr said:
I did that procedure up too the point were the battery gets stuck halfway out and it feels like I’m pulling on wire, or cables. Around the positive connector of the battery . What could be the problem and anything else I can do ?
Click to expand...
I have never taken mine out, but I think I remember someone once posting that you have to lift up on it while pulling it out... May have to search the site on battery removal
 
johndeeredr said:
I did that procedure up too the point were the battery gets stuck halfway out and it feels like I’m pulling on wire, or cables. Around the positive connector of the battery . What could be the problem and anything else I can do ?
Click to expand...
Did you remove the (+) Positive lead on the Right Hand Side? If not, you'll need to do that on the larger bolt which is also used as a jump contact.

Also, use a wire tie on the cable terminal in order to help assist with routing the positive cable back to the terminal location from the left hand side during re-installation.
 
That’s what I suspected. That the positive cable was either hanging up or needed to be disconnected. Makes sense from the pics were to disconnect it . Thank for your help gentleman. I suspect that’s the original battery the bike came with . Grey in color and has the BMW logo on it . What’s the average battery life for them it’s a 2022 model and probably 3years old . I’m thinking I’m getting close to the end of its usefulness.
 
I think you folks may be making a mistake. The Auxiliary port is shut off by the CanBus a few minutes after the bike is turned off and you cannot use a standard charger such as a battery tender to maintain you battery. It will not be able to provide current through to the battery. You must connect a standard charger direct to the battery. If you have an Optimate or BMW OEM charger that is able to communicate with the Canbus and open the circuit then you can change and maintain the battery with Auxiliary port.
 
johndeeredr said:
Good morning all ! My question is instead of going through the pain of removing the battery just to hook up my battery tender harness., there is an adapter plug next to the reverse lever on my 2022 R1800B . Amazon has a plug with the harness and connector that will work with my battery tender left over from my Harley. Can I use that port to use my tender to keep the battery charged ?
Click to expand...
BMW actually sells a fairly reasonably priced battery tender that plugs into that outlet. Works rather well
 
The ports shut down as a 12 V power supply; however, I have found that the 12 V socket on my Model B (just below the Reverse select lever) is active as a charge input.

When I plug my charger in, the rectifier detects the battery and charge State; then, the rectifier module starts to charge the battery showing the input current in Amps on the screen.

Once the battery reaches the appropriate float voltage, the rectifier or charger units goes into a standby mode.

At least, that's my experience when charging my bike. 2022 R18 B
 
R2K said:
I think you folks may be making a mistake. The Auxiliary port is shut off by the CanBus a few minutes after the bike is turned off and you cannot use a standard charger such as a battery tender to maintain you battery. It will not be able to provide current through to the battery. You must connect a standard charger direct to the battery. If you have an Optimate or BMW OEM charger that is able to communicate with the Canbus and open the circuit then you can change and maintain the battery with Auxiliary port.
Click to expand...
 
Got my plug adapter today and plugged it in to the port next to the reverse lever on my 2022 R18B . Used a multimeter and shows no voltage . Turn in the power and now shows voltage.. I not sure why your plug is hot all the time . Guess I’ll be pulling the battery and hooking directly to the battery terminals.
 
johndeeredr said:
Got my plug adapter today and plugged it in to the port next to the reverse lever on my 2022 R18B . Used a multimeter and shows no voltage . Turn in the power and now shows voltage.. I not sure why your plug is hot all the time . Guess I’ll be pulling the battery and hooking directly to the battery terminals.
Click to expand...
You're measuring 12 V DC out... A charger is providing 12 V DC."in" to the battery in a parallel fashion; perhaps the CanBus switches in this circuit to allow that connection to the battery..?

I really never thought about it or how it works, I just know it works whether I plug my charger into the bike shortly after turning it off or a few days after shutting down the bike; I do observe the charger checking the battery status and then reporting current flow...

How do it know...?
 
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