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· Wrencher Extraordinaire
2005 K1200LT
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Before you parked it how much did you drive the bike each time you started it? FWIW my 2009 GS had two batteries go bad in the first year I had the bike. Took the second one apart and found the internal tie straps between cells to be very flimsy. Needless to say another BMW battery did not go back in.
 
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Discussion Starter · #4 ·
Before you parked it how much did you drive the bike each time you started it? FWIW my 2009 GS had two batteries go bad in the first year I had the bike. Took the second one apart and found the internal tie straps between cells to be very flimsy. Needless to say another BMW battery did not go back in.
maybe 15mi, I dont recall, but at LEAST a commute drive home from work.

The system was "on" for maybe two minutes doing a read off the ECU, that was it.
 

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Been parked for 2 days, go to start it today...TFT warning on battery.​
Yup, its dead.​
???​
Its been dark and quiet in the garage..​
Any added accessories like a GPS? Was everything shut off? Maybe parking light left on? I have a 2013, and if I remove my Zumo XT before it tells me “power has been lost” the Zumo cradle stays powered and will kill the battery in a couple of days. Weird, I know, but that’s how mine works. Any extreme cold temps in the garage?
 

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Discussion Starter · #8 ·
Any added accessories like a GPS? Was everything shut off? Maybe parking light left on? I have a 2013, and if I remove my Zumo XT before it tells me “power has been lost” the Zumo cradle stays powered and will kill the battery in a couple of days. Weird, I know, but that’s how mine works. Any extreme cold temps in the garage?
No new power accessories added at all. But charging on the post directly, allowed me to install a spare bluetooth battery minder..so I can keep an eye on it.
 

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2019 R1250RT
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278 Posts
Definitely not normal. Did you check if the battery connections are tight? My 2019 has the original battery and it doesn't seem to matter how long it sits, it always starts right up.
 

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2021 R1250 RT
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246 Posts
The other thing that seems to impact battery life, or at least used to, is how close your key fob is to the bike. Some ideas are that by being too close, there's a constant communication back-and-forth which drains the battery. Not entirely sure I buy into it but then again I've seen stranger things.

Last but not least is if you have a dash cam / security tracker - seen those drain the battery.
 

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Discussion Starter · #13 ·
Keyfob is in the jacket pocket, but good to know!

But here is hard data.


Got the Covid (wife's an airline pilot so..its a thing here) sos I have not ridden in two days, certainly NOT a horrible amount of time to let a battery sit.

Depressing results...

Rectangle Slope Font Parallel Pattern

We are certainly going to BMW tomo..err, as soon as the new monsoon hitting Norcal fades out this week.
 

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I am not impressed by those BMW batteries. The battery on my 19 R1250RT went south just past the warranty period. :( (The bike is always on the tender when I'm not using it)
On my 07, I had a cheap generic battery that was still good when I sold it after 6 years...
YMMV
 
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K1200LT 2005
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412 Posts
After decades of reliable batteries from BMW, Yuasa, and Odyssey I had about three in a row that were unreliable very quickly. I initially thought it was due to the KLT having parasitic drain. Finally realized the batteries were at fault. After three replacements, I got a Yuasa which works as expected. Good chance your battery is wonky because it's not up to spec.
 

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I am not impressed by those BMW batteries. The battery on my 19 R1250RT went south just past the warranty period. :( (The bike is always on the tender when I'm not using it)
On my 07, I had a cheap generic battery that was still good when I sold it after 6 years...
YMMV
I picked up my 2019 1250RT in Nov of 2018. The original battery is still going strong. The secret sauce? Some luck in getting a good battery from the start but mostly, regular use of a good battery maintainer. There have been a couple of times when I forgot to plug in the maintainer for a few weeks but the battery was fine. What I try not to do is ride immediately after letting the bike sit for weeks. I use the maintainer to slowly charge it back up as opposed to the bike charging it up fast. While my bike is garaged at home here in Texas, the garage is not air conditioned so the battery is living in a pretty harsh environment. A good friend of mine had a stock BMW battery in his 2014 R1200RT last six years. I use the same battery maintainer he does.
 
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