di2diy: aren't you the guy selling a competing system to Calfee's internal battery on Ebay? Nothing wrong with that, but it makes me question your objective criticism. I have talked to Craig Calfee about their system, they are a company with a long history in the business, they have talked directly to Shimano about what they are doing and some key Shimano US people have it on their own bikes.
mrfish, as was pointed out you need to charge the system 3 times a times a year, so the wear and tear is not a major issue. Personally I had my Di2 bike on an airplane 3 times last year and needed to disconnect some cables more for travel than charging. If you use Shimano tool to do it, it is pretty straight forward.
Yes I'm that guy selling on eBay, and no my criticism is not aimed at putting down what Calfee's selling, it's just a fact LIPO and LION batteries can explode if charged with an inexpensive charger like they are using. They should be charged with a balance charger, which requires 3 wires, not just two going to the cell's like they are doing, this can be dangerous, in fact any time you charge these type of batteries, it can be dangerous, including the one I sell with my system with a balance charger. (http://www.rcgroups.com/forums/showthread.php?t=209187
) I wouldn't say I'm really competing with Calfee, yes its true I'm selling a similar product, and yes, I also do conversions on non Di2 bikes to place the harness all internal. I do about 4-5 bikes a month for friends, and a few LBS, at a little more than half the cost, I'm doing it because it helps people, not to make money. However I do not have the skill that they have when it comes to painting and touch up, or carbon fiber repair, but thats because I do not cut large holes in the frames like they do, so I don't need the touch up, or repair. I have also talked to Shimano, and to Calfee for that matter. I have also talked to "some key Shimano US people have it on their own bikes" and know that they have had to have frames (SL3) replaced after being done by Calfee, because of the large hole cut in the BB area ruined the frame.... Stuff happens. As I have posted on other forums I think Calfee does a great job, and I think the idea they came up with is clever, but it is less than ideal, in my opinion. What I think is a better way to go if you want to charge the battery without removing it is the way Icarus does it (http://icaruslights.com/batteries/
) in fact I like that battery setup more than mine, or Calfee's. Calfee is as you said "a company with a long history in the business" and I seriously doubt that anything that I'm doing, or criticizing will change that. Thanks for your comment.