Question about 2002 BMW K 1200 LT

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I keep a slow trickle on the battery at all times, but I still can't seem to keep it charged. How can I tell if something is draining the battery? COuld it be the alarm system light? P.S. My husband and I both have harley's but we love this bike!!!

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First check if the battery is any good,, it maybe that its lived its life and you need to put a new one on the bike,,also check if this battery charger is realy charging the battery up,,the charger may be working but is the charge reaching the battery? to check if there is a drain just hook up a meeter if it reads a big drain when nothing is on then its the alarm using up the power but the charger should keep the battery toped up ok? i keep a solar sell of 2.5 watts hooked up to my bmw all the time and i never have had a flat battery yet!!! a charger may "over cook" the battery and that will kill it off very fast, all it needs is a stand by charge going into it thats only about 50ma 's and a battery's life is only about 2 to 3 years so if its older than this fit a new one to the bike

Posted on Jul 28, 2010


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If it is within warranty, have them replace the unit. Are you using a wall charger or a trickle-charger such as the USB Cable? The wall charger is the only way to truly charge it to full.

If you are using a USB charger or other trickle charger, after the device says it is fully charged remove it from the charger for about 2 minutes and then reconnect it. It will then charge (most of) the rest of the way.

If you don't do this, the problems gets worse and worse. After 1 day, the trickle charger may get you up to a 90% charge. After two days, 80%, etc. After a week you'll only be holding half a charge, even though the device is reporting a full charge while on the charger.

Another tip I have found is to perform a soft-reset after removing it from the charger, particularly if it has been plugged in for a long time at full charge (more than an hour or so). It seems like the device doesn't always detect that it has been unplugged and tries to **** down juice as if it were still plugged in. If you have noticed that your device gets pretty hot when the battery drains quickly, this is probably what is happening to you.

You also haven't mentioned the programs that you are using during the day. Some programs, particularly chat clients, will drain the battery in about 5 hours, though obviously you're not using anything like this while in flight mode.

One more thing. You noted that you were told that leaving it on the charger whenever possible is the thing to do. This is incorrect. The more the battery is exercised in this way, the shorter the lifespan of the battery will be. With any mobile device we're all bound to charge it every night, but once it is charged you want to take it off the charger. A battery being fully charged is just as bad as a battery being fully drained, so you want to keep it somewhere in between as much as possible. __________________
If I could be of further assistance, let me know. If this helps or solves the issue, please rate it.
Thanks, Joe

I’m happy to assist further over the phone at

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