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PostPosted: Fri Dec 08, 2006 9:51 pm 
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Joined: Fri Jul 16, 2004 12:06 am
Posts: 1246
Location: A Scotsman on rock in the pacific
The battery in my Dura-Ace SRM died so I decided to repair it myself. Took some photos during the process if anyone is interested:

http://www.mikezagorski.com/archives/000700.php

Here are some photos...


Attachments:
File comment: Removing the white disc / cover after chainring removal.
2006-12-7_srm4.jpg
2006-12-7_srm4.jpg [ 29.54 KiB | Viewed 8135 times ]
File comment: Inside the SRM.
2006-12-7_srm6.jpg
2006-12-7_srm6.jpg [ 47.38 KiB | Viewed 8356 times ]
File comment: The old dead battery. Electrochem Lithium QTC85 3B880
2006-12-7_srm9.jpg
2006-12-7_srm9.jpg [ 37.25 KiB | Viewed 8274 times ]
File comment: Soldering in the new battery.
2006-12-7_srm17.jpg
2006-12-7_srm17.jpg [ 32.25 KiB | Viewed 8329 times ]
File comment: Phew!
2006-12-7_srm18.jpg
2006-12-7_srm18.jpg [ 41.22 KiB | Viewed 8237 times ]
File comment: Done!
2006-12-7_srm20.jpg
2006-12-7_srm20.jpg [ 65.28 KiB | Viewed 8268 times ]

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Last edited by mzagorski on Sat Dec 09, 2006 2:06 am, edited 2 times in total.
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Posted: Fri Dec 08, 2006 9:51 pm 


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PostPosted: Fri Dec 08, 2006 9:59 pm 
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WWotY 2006 / Smart convert
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Very interested, thanks.

They dont advise you do this yourself so thats a big pat on the back from me! :shock:

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PostPosted: Fri Dec 08, 2006 9:59 pm 
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Joined: Thu Aug 05, 2004 7:33 am
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Location: Europe
Nice job, thanks for taking the pictures :thumbUp: Those might come in handy one day :D


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PostPosted: Fri Dec 08, 2006 10:00 pm 
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Joined: Mon Dec 19, 2005 7:22 pm
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Location: Wateringen, The Netherlands.
Very interresting post Mike,
Have never seen a SRM - inside 8)
you did it but does it also work? :P

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PostPosted: Fri Dec 08, 2006 10:19 pm 
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Location: A Scotsman on rock in the pacific
The problem was that i felt like I was going at 500w when SRM was reading maybe 200w.. lol... checked the zero offset.. and it would start at 420 or so and just decline to very low numbers.... meaning battery was dieing. Tired of sending stuff back to SRM for $$$ repairs so after some advice from people decided to take a chance and do it myself. Wasn't that hard.. Just gotta take your time, be careful with the soldering etc.

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PostPosted: Fri Dec 08, 2006 10:38 pm 
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Location: Vienna Austria
Do u know what it costs to let the battery change by SRM?


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PostPosted: Fri Dec 08, 2006 10:43 pm 
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Joined: Thu Jun 16, 2005 8:44 am
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Location: Australia
how old are is your system, I just bought some and wondering how long it will be till they need new batteries? of course it will depend on how much i use it though.


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PostPosted: Fri Dec 08, 2006 10:47 pm 
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Joined: Fri Jul 16, 2004 12:06 am
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Location: A Scotsman on rock in the pacific
New battery is probably something like $50.. but then there's the cost to ship the SRM to Colorado (if you're in the US)... and for them to repair it and send it back... Time and Money... I don't have a second crankset to use if I sent the SRM back. I've had bad experiences with customer service at SRM this year in the US.... maybe SRM is just becoming too popular and sometimes they're very very busy. LJ said they advise not to do that yourself... Sure... As well as the risk of you breaking it... they'd also lose out on making money if people repaired SRM's at home. I just spent $100 or so for a piece of plastic cover on my Powercontrol... overpriced IMHO.

I can't remember how long the batt is meant to last.. maybe 1-2 years or so. I put about 30,000km on my before it went dead.

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PostPosted: Fri Dec 08, 2006 10:57 pm 
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Location: Vienna Austria
And the risk to do anything wrong is not so high and its working well like changed by SRM!

Cause next year I'll get a FSA version, but hav to change the battery, and I have to ship it to germany and back again!

So there is nothing to fear???


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PostPosted: Fri Dec 08, 2006 11:01 pm 
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Personally, if you can turn your hand to it, then why not! Good job Mike.

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PostPosted: Fri Dec 08, 2006 11:04 pm 
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mzagorski wrote:
New battery is probably something like .



5 euro

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PostPosted: Fri Dec 08, 2006 11:13 pm 
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Location: A Scotsman on rock in the pacific
battery direct from electrochem in NY is $10. Shipping the battery to hawaii was the killer.. $30 for fed-ex. dangerous goods (lithium).

i just dont like the "oh.. it's super special and we are the only people that can fix it mentality"... we're all human.. all have arms, eyes, etc... not rocket science to change a battery. But if anyone does it and it goes wrong.. I'm not responsible :wink: definitely done at your own risk LOL.

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PostPosted: Sat Dec 09, 2006 1:05 am 
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Joined: Sat Apr 01, 2006 12:17 am
Posts: 3603
Location: A bigger rock in the Pacific (AUS)
Nice job mike, I was wondering if you were going to put up some photo's or not, as it's something that isnt done often and would probably be pretty handy to do. Is it possibly to change the powercontrol batteries as well (actually, would you ever need to change the powercontrol batteries?)

How much time did it take you to fit the new battery?

And seeing the inside, I've got a nasty feeling someone is eventually going to try WW tuning the inside of the srm to drop its weight closer to the DA crank :?


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PostPosted: Sat Dec 09, 2006 1:51 am 
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Joined: Fri Jul 16, 2004 12:06 am
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Location: A Scotsman on rock in the pacific
Time to replace the battery wasn't much. I probably did the whole process within an hour... well, 1.5hrs if I include the walk to walmart to get a soldering iron. Time to take off cranks, clean the srm, pry off the white disc, remove old battery by heating up existing solder... bend pins on new battery, solder the new one it... re-install everything, chainrings, and put back on bike. 1-1.5hrs total is enough I think. I didn't rush either.

powercontrol.. from what I was told the battery is glued into the case... the bottom piece I think. I've had two powercontrol batteries changed.. they die more often than the cranksets battery I think. I got the top piece of my PCV sent back to me... so could disect that sometime.

the inside also looks quite drilled out already. I doubt you can trim that much weight off really.

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PostPosted: Sat Dec 09, 2006 2:55 am 
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Sweet! :thumbup:


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Posted: Sat Dec 09, 2006 2:55 am 


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