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PostPosted: Tue Aug 05, 2014 7:20 am 
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Joined: Sun Jul 14, 2013 1:26 am
Posts: 113
Does anyone have any experience with a shimano di2 internal battery in a Cervelo st.

It doesn't seem that it would fit up the aero seatpost. Does anyone know where you can put it?


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PostPosted: Tue Aug 05, 2014 4:44 pm 
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Joined: Sat Apr 26, 2008 4:14 pm
Posts: 158
Location: Gothenburg, Sweden
I built my S5 with internal battery, see thread here. I put the battery in the seat tube (wrapped in some foam to prevent rattling). Since the maximum seat post insertion is quite short on the S5 (6cm min, 10 max if I recall correctly) the seat post will not reach far enough to touch the battery.


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Posted: Tue Aug 05, 2014 4:44 pm 


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PostPosted: Tue Aug 05, 2014 5:24 pm 
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Joined: Sun Jul 14, 2013 1:26 am
Posts: 113
So I didn't see any pictures or the battery inside the seat post of the foam/battery assembly. Could you please take a picture or 2 for me?


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PostPosted: Tue Aug 05, 2014 7:58 pm 
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Joined: Sat Apr 26, 2008 4:14 pm
Posts: 158
Location: Gothenburg, Sweden
Without being a professional photographer (and using corresponding equipment) its near impossible to take a picture thats shows anything of interest given how far down the seat tube the battery is. You will have to trust me it can be done.

1. Attach the Di2 wire to the battery
2. Wrap the battery in foam (or part an inner tube or whatever...). Use small zip ties to secure the padding.
3. Push the package down the seat-tube with "wire-side" facing down.
4. Pull out the cable from BB opening and attach it to the junction box (I pushed the junction box up the down tube before installing the pf-bb)


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PostPosted: Wed Aug 06, 2014 6:06 am 
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Joined: Tue Dec 16, 2008 9:16 pm
Posts: 162
Location: Las Vegas, NV
Yep. Did the same thing. Just stuck it in the seat tube wrapped with foam. It eventually lodges where the seat tube starts to form around the wheel. Couldn't be any easier....


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PostPosted: Wed Aug 06, 2014 6:07 am 
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Joined: Tue Dec 16, 2008 9:16 pm
Posts: 162
Location: Las Vegas, NV
BTW Did the same thing on my P3


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PostPosted: Wed Aug 06, 2014 7:03 pm 
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Joined: Sun Jul 14, 2013 1:26 am
Posts: 113
Thanks allot. Just waiting for my 6870 group to arrive now


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PostPosted: Fri Aug 08, 2014 2:29 pm 
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Joined: Tue Oct 23, 2012 10:52 pm
Posts: 732
Location: PHL
I used this http://ritcheylogic.com/road/seatposts/ ... ounts.html
and some zip ties on my Fuji sst, similar aero seatpost. Just shove it up in there, the battery is very light it isn't going anywhere.

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Bicycle1
Bicycle2


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PostPosted: Sat Aug 09, 2014 12:38 pm 
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Joined: Wed Mar 06, 2013 4:23 pm
Posts: 618
Location: Austin, TX
Nope it's got to go in seat tube or possibly the down tube. Seat post is too skinny to accommodate the battery.

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My Cervelo R5
My Lynskey Helix
My MTB


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Posted: Sat Aug 09, 2014 12:38 pm 


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