A lot of people replace the LT battery with an Odyssey PC680. I had one on my '07 LT, and when it comes time to replace the one in my GTLE, I'll probably go with it also. It's fairly simple to replace and there is a lot of info on this forum about how to do it...
Odyssey pc680 is the only battery i will install in my bikes or my customers bikes period. The k1200 not only has a demanding electrical system it is the only bike i know of that has a full size alternator like a car. I believe at least 65 amps. The pc680 is a gell cell style battery and can discharge completely without hurting itself like led acid batteries will. When i started riding LT bikes i used led acid batteries but every time i let it sit for a week or so with the alarm on the battery would be dead. The lead acid batteries dont recover no matter how new they are.
Hope this helps.
The Odyssey PC680 is definitely the way to go. Whatever you do, just don't install it backwards. I see that a few people has installed a battery backwards and unfortunately, the electronics and wiring isn't forgiving.
Also, very important! Disconnect the negative lead first, then positive. When connecting new battery connect positive lead first, then negative. Never have just the negative lead connected. This can fry an ECU. BTDT.
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