Remove Di2 battery from casing and re-solder?

Discuss light weight issues concerning road bikes & parts.
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klingej
Posts: 130
Joined: Fri Jun 19, 2009 12:03 pm
Location: Denmark

by klingej

Hi all,

I've been searching for a step-by-step instruction as to how you can strip the original Dura Ace Di2 battery from the casing and rewire (re-solder) it into the wire from the wiring harness. I seem to remember that Coloclimber did it on a Time a while ago but cant seem to find the post.

Anyone who can either 1)point me to a few posts that shows how to do this or 2)have instructions yourselves that you'd be willing to share?

Br Jonas

WeightySteve
Posts: 293
Joined: Wed Jun 09, 2010 10:44 am

by WeightySteve

My advice, forget about hacking the actual battery, just buy some different 3.7v cells (14650's). Much easier. There is a mini circui board in the battery (load/charge protection I think it is) and gets messy trying to re-use.

cymans
Posts: 95
Joined: Sat May 28, 2011 10:17 pm

by cymans


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HammerTime2
Posts: 5430
Joined: Thu May 04, 2006 4:43 pm
Location: Wherever there's a mountain beckoning to be climbed

by HammerTime2

Don't just do it, find out how not to do it. Fried DA Di2

WeightySteve
Posts: 293
Joined: Wed Jun 09, 2010 10:44 am

by WeightySteve

Cococlimbers thread:-

viewtopic.php?f=10&t=67791

Also, had to charge mine today, so took some pics of my procedure along the way in case you're interested in this approach (using commonly available Lipo cells, chargers & holders)...

First, a very useful peice of coat hanger...

0.jpg


So, bike needing charge...

1.jpg


Seatpost off (spot the concealed pump in the seat post). Battery is down the tube...

2.jpg

3.jpg


Doesnt look pretty at this stage, but its weather proof. (Water gets everywhere!)

4.jpg


Removing the (disposable) layers, which are just plain old re-sealable baggies...

5.jpg


Battery holder with connection plug (£0.99 from Ebay)...

6.jpg


Cells removed (16340's, £4.99 from ebay)....

7.jpg


Into the chargers(s) (£5.99 from ebay)....

8.jpg


Wait... ( or swap in your 2 spares cells:) )

9.jpg
Last edited by WeightySteve on Fri Sep 07, 2012 8:57 pm, edited 1 time in total.

WeightySteve
Posts: 293
Joined: Wed Jun 09, 2010 10:44 am

by WeightySteve

Now, start re-assembly...

10.jpg


More weatherproofing...

11.jpg


Pop it back in (with the coat-hanger/hook attachment)...

13.jpg

14.jpg


Pump goes fully back into the post (easily removed with a quick tap)

15.jpg


And done...

16.jpg

klingej
Posts: 130
Joined: Fri Jun 19, 2009 12:03 pm
Location: Denmark

by klingej

Thanks for all the excellent answers guys. I'll give it a go based on the advice here - thanks!

Br Jonas

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