My battery seems to last about 3 years maybe less on my K12 here in mild northern Cali. I checked my usual sources and $83 seemed the typical price. I finally got annoyed at spending so much for so little battery and looked around. I found this chinese battery for $42 out the door. It had some poisonous reviews mostly about the short battery post bolts and cheesy nuts instead of a hassle free screw in design. I found that these reviews were BS. I removed the slightly longer bolts from the old battery and they fit the new cheesy nuts and in about the same time installed my battery a week ago. The bike has started just fine with all the indications of a mighty strong battery! I’ll see how long it lasts but considering that i could buy 2 for the price of 1 from the place i usually dealt with plus free 2 day shipping. The poles and size were exactly the same. Heres the amazon link.