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PostPosted: Thu Feb 04, 2010 9:42 pm 
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Battery casing and harness weight removed- 29 grams for a total of 61 grams saved by removing the battery mount, harness and casing.
That puts the modified Di2 group at or below 7900 weight.
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PostPosted: Thu Feb 04, 2010 9:46 pm 
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@ Coloclimber

:thumbup: Great work.

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Posted: Thu Feb 04, 2010 9:46 pm 


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PostPosted: Thu Feb 04, 2010 9:55 pm 
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Thats the parts you removed?Where is the parts you left???And how you will recharge the battery? :O


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PostPosted: Thu Feb 04, 2010 9:59 pm 
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I will re-configure the battery to fit in the seattube/seatpost and use quick connectors when it needs a charge-
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PostPosted: Thu Feb 04, 2010 10:11 pm 
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Wow ,really interesting!Keep going.Waiting for new pics! :thumbup:


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PostPosted: Thu Feb 04, 2010 10:27 pm 
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Are those standard sized AA LiOn rechargeable batteries?


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PostPosted: Thu Feb 04, 2010 11:09 pm 
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4/5 AA. The original cells are Lithium ion size 14430 - 3.7v each

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PostPosted: Fri Feb 05, 2010 12:54 am 
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i've been waiting for this bike for SO long :(


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PostPosted: Fri Feb 05, 2010 4:19 pm 
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Will you change the standard batteries for the Li-Po that somebosy talked about in the "Shimano Di2 tuning" topic?

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PostPosted: Fri Feb 05, 2010 4:50 pm 
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No. I have 2 x Di2 bikes so I want to keep the charger and battery harness the same for both.

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PostPosted: Sat Feb 06, 2010 4:20 pm 
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I re-wired the batteries, added the water proof quick connector and tested it on my other bike and it all works.
Then I shrink wrapped the package and cut a small piece of foam pipe insulation and wrapped it so it fits up the seatpost.

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I also added a quick connect to the circuit board and harness for charging in 6+ months.

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PostPosted: Sat Feb 06, 2010 4:37 pm 
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Amazing, I love this thread for all the modifications and ideas.

It also saves me posting a question about stripping paint off a CF frame
(I'm surprised by how much all the graphics and lacquer weigh, by the way).

Perhaps I missed it, but are you going for a clear coat (matt or glossy)
or are you leaving the carbon fully exposed?

I personally don't like Di2 for it's wires and maintenance (battery charging).
I think it would have made far more sense if they made it coded wireless
(with some very good coding may I add :)). And perhaps a solar charger :lol:.

Keep up the good work.

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PostPosted: Sun Feb 07, 2010 8:16 am 
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This build is a wonderful thing to follow, really shows the creativity of people........thanks for sharing.


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PostPosted: Sun Feb 07, 2010 4:37 pm 
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Thanks for the encouragement. I had some ?s about the quick connectors. I wanted something light and waterproof. I didnt like some of the micro connector options. I picked these up at NAPA auto parts. They are trailer hitch connectors and are quite light and easy to pull apart. I needed 3 pairs.

The same connectors are used to attach the cels to the harness and PCB (protection circuit board) so the battiers can be charged with the standard Shimano charger. There is just one more lead that shuts off the charger when they batteries are fully charged.

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Posted: Sun Feb 07, 2010 4:37 pm 


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PostPosted: Sun Feb 07, 2010 5:05 pm 
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Bravo Nathan. You've managed one heck of a job on this project between the paint stripping and the wiring harness work. Fantastic ingenuity and attention to detail. Not to mention brass balls for doing both to brand new parts and frame.

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