Battery Charging/Tender Thread (Merged) - BMW NineT Forum
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post #1 of 149 Old 04-18-2014, 05:33 PM Thread Starter
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Battery Charging/Tender Thread (Merged)

I tried charging my R9T battery using a cheap battery tender with a adaptor plug into the aux socket, it wouldn't work, I tried turn on the ignition and off, it worked for 5 min then off, then I found this charger on the website TecMate OptiMate 4 Dual Program Battery Charger for BMW CANbus - RevZilla.
It seems that the charger must be compatible with the can bus system, is this the right charger? Do I have to buy one from the dealer? Any one has a good suggestion, thanks
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post #2 of 149 Old 04-18-2014, 11:34 PM
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Many people, including myself, avoid this issue and purchase the relatively inexpensive Deltran Battery Tender charger. Deltran includes the necessary direct to battery 'pigtail' to plug in the charger with the standard SAE plug.

And, while the BMW manual states disconnecting the battery terminals, that is pure phooey as I, among others, of course have used these chargers on all BMW's with no concern for many years, and more likely the prohibition based upon the notion that there are some pretty 'dirty' chargers out there.

I currently have three Deltran Batter Tender chargers, charging three BMW cycles with CAN-bus technology with these chargers. I hedge my bets a bit by putting them on an inexpensive light timer so that they charge for only one hour per day.

Good luck!

John,
Jacksonville, FL
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post #3 of 149 Old 04-19-2014, 01:05 AM
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Pigtail to the battery. Don't use the accessory plug.
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post #4 of 149 Old 04-19-2014, 03:23 AM
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Pigtail to direct to battery with an inline fuse fitted in the positive line
I've used a optimate 2/3 for 5 yrs without probs
You really need a BMW trickle charger for aux socket as it runs via the canbus ,but the very latest optimate are now canbus circuit friendly so can be plug n play without a pigtail needed
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post #5 of 149 Old 04-19-2014, 07:05 PM
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I happened to ask my BMW dealer about battery chargers today and he wanted to sell me the Optimate 4 with CANbus over the BMW charger.
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post #6 of 149 Old 04-19-2014, 07:13 PM
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Groan, battery threads almost make my hair go on fire. They are worse than oil threads. Groan! Why is it so complicated, don't people read the replies?

John,
Jacksonville, FL
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post #7 of 149 Old 04-19-2014, 11:39 PM
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Use the Deltran Battery Tender on my R1200C and my R NineT, through the acc. port with no problem.
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post #8 of 149 Old 04-29-2014, 05:44 PM
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What is it that makes a CanBus charger special? Limitation of current? Special Voltage?

I could see how a high amperage charger would be really tough on some wires and circuits if they were not heavy enough and that seems to be a problem because you can't have more than a 5 amp draw on the accessory plug.
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post #9 of 149 Old 04-29-2014, 05:54 PM
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Just install a 15 amp Powerlet brand port where the factory port is...wire it directly to the battery. Then, like myself, you can use a Battery tender, Gerbings, etc.
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post #10 of 149 Old 04-29-2014, 10:59 PM
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Oh boy, anybody up for this??
http://en.wikipedia.org/wiki/CAN_bus


Quote:
Originally Posted by BlueBrick View Post
What is it that makes a CanBus charger special? Limitation of current? Special Voltage?
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Last edited by wallmon; 04-29-2014 at 11:02 PM.
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