I regularily get over 5 yrs on mine. I attribute it to NOT using battery tenders. The idea is good, the regulators from china are questionable.
chrs-mat
A tender is good for those who need it. My RC51 battery died prematurely a couple of times because it was discharged too often from sitting. At almost $150 a pop, I didn't want to replace it all the time. I would love to ride it all the time to keep it charged, but I would often travel for work being gone weeks, if not a month or so at a time, leaving me no time to ride. Once I got a tender, the Battery Tender, I haven't had an issue with a battery.
I am on my original battery on my '09. It has given no signs of failing. It always starts. When I can't ride for a while I leave it on a tender. It hasn't been on the tender for a while since I am home and can ride it more, over the Winter when I ride less, it will be on the tender.
There is nothing wrong with the regulator on it. If you have issues with products made in China, then you should probably give up using electronics in general, most are made in Asia, and a vast majority are made in China. Have an iPhone? Made in China. Is it of inferior quality? Sorry, but comments bashing products made in "x" country bother me. As far as electronics go, the US put out a lot of incredibly inferior products a number of years ago and lost out to Asian manufacturers. My father was in the TV business then and the quality of some of the electronics made in the US was appalling. I just hate that attitude. I travel worldwide and have been to every continent, yes, even Antarctica, and over 100 countries. I have friends in countries all over the world and my wife is from Thailand. She is made very well by the way. So I have issues when I hear someone make blanket statements bashing products from another country implying the the only good products are made in the USA. That may have been true at one time, but not anymore. There are good products made all over. And by the way, before you question my patriotism, I love my country, I have been all over the world and as a result, I truly appreciate what we have here, more than many people I know. I know how it is in other countries. I do not like the current trend to make our country like those in Europe, I have spent a lot of time there and I know we have the cheapest goods and services of anywhere I have been, period. Sorry, I just hate that. End rant.
So far, I have had no issues with the battery on the C14. The RC51 used a different type battery, and was much smaller, hence the need to have it on a tender. It simply discharged too fast while sitting. The RC51 also took a lot of juice to turn over the motor. I don't think the C14 is as bad in that regard, still, I will keep it on the tender if it is going to sit for a long time.