User Tag List

Results 1 to 16 of 16

Thread: Di2 battery not holding charge

  1. #1
    Join Date
    Jun 2015
    Location
    Belgium
    Posts
    799
    Post Thanks / Like
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)

    Default Di2 battery not holding charge

    About a month ago, I noticed that the battery is dead after about a week, following a full charge, even when I had not ridden the bike during that time.

    The group set, including the seat post mounted internal battery, is a little over 2 years old. It hasn't seen much mileage, and since I live in a flat area, I don't think I shift gears as often as someone living in a hilly area.

    The firmware is up to date.

    No parts have been replaced since new.

    There is no limit screw issue, judging from the fact that the system does not keep pushing when already in the largest or smallest sprocket or when switching between chain rings.

    Shortly before this started to happen, I did have a minor crash where the RD got a bit scratched. Shifting works just fine, as before. Well, when the battery isn't dead.

    The shift levers are not touching anything whilst being stored.

    The storage environment temperature is about 0įC/32įF at night, a bit warmer during the day and dry, ie, humidity not discernible.

    I disconnected and reconnected the cables at the bar end junction, battery and RD.

    Solid green light for 3 days. Blinking green light on day 4. Dead on day 5. No riding involved. Just a couple of tests shifting up and down and the battery checks, with the chain moving 2 sprocket positions.

    I'm all ears if you have an idea about the problem or the solution, or suggestions on properly diagnosing the problem.

    Many thanks.
    Chikashi Miyamoto

  2. #2
    Join Date
    May 2008
    Location
    DC
    Posts
    23,847
    Post Thanks / Like
    Mentioned
    16 Post(s)
    Tagged
    0 Thread(s)

    Default Re: Di2 battery not holding charge

    Use an alcohol soaked q-tip and clean everything in sight than use some di-electric grease (tune up grease) from your friendly neighborhood auto parts store to dose the contacts.

    Dirt and what not can cause voltage leak.

    https://www.amazon.com/Permatex-2205.../dp/B000AL8VD2
    Last edited by Too Tall; 01-26-2020 at 01:36 PM.

  3. #3
    Join Date
    Jun 2015
    Location
    Belgium
    Posts
    799
    Post Thanks / Like
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)

    Default Re: Di2 battery not holding charge

    Ok, thanks. The RD connection would be the prime suspect for that.
    Chikashi Miyamoto

  4. #4
    Join Date
    May 2011
    Location
    Lebanon, Ohio
    Posts
    319
    Post Thanks / Like
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)

    Default Re: Di2 battery not holding charge

    Do you have access to Shimano SM-PCE02 to an error check? It will tell you what maybe going on.
     

  5. #5
    Join Date
    Jun 2008
    Location
    Bermuda
    Posts
    1,422
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default Re: Di2 battery not holding charge

    Do you have access to a second front junction box - an EW90? I have had two of those go bad, leading to very fast battery drain in otherwise good batteries.

    A two year old DI2 battery should be solid for a good while longer.
     

  6. #6
    Join Date
    Jun 2015
    Location
    Belgium
    Posts
    799
    Post Thanks / Like
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)

    Default Re: Di2 battery not holding charge

    Quote Originally Posted by DBordewisch View Post
    Do you have access to Shimano SM-PCE02 to an error check? It will tell you what maybe going on.
    No, I don't, so I was thinking that I should ask my LBS if they have one to run the diagnostics for me.

    Quote Originally Posted by bdaghisallo View Post
    Do you have access to a second front junction box - an EW90? I have had two of those go bad, leading to very fast battery drain in otherwise good batteries.

    A two year old DI2 battery should be solid for a good while longer.
    No. How did you figure out that it was a bad junction box, if it wasn't through the use of SM-PCE02 or 01?
    Yeah, the battery is too new to die, so it's more likely that the problem lies somewhere else in the system.
    Chikashi Miyamoto

  7. #7
    Join Date
    Jun 2008
    Location
    Bermuda
    Posts
    1,422
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default Re: Di2 battery not holding charge

    Quote Originally Posted by Chik View Post

    No. How did you figure out that it was a bad junction box, if it wasn't through the use of SM-PCE02 or 01?
    Yeah, the battery is too new to die, so it's more likely that the problem lies somewhere else in the system.
    After swapping out the battery didn't solve my issue, I swapped out the junction box and the problem was solved.
     

  8. #8
    Join Date
    Jan 2009
    Location
    Wellington, New Zealand
    Posts
    2,453
    Post Thanks / Like
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)

    Default Re: Di2 battery not holding charge

    Well Di2 is amazing and always works perfectly. Until it doesn't.

    Unfortunately you're in a tough position and this is where a good bike shop should earn their money as they're able to diagnose and test quicker and easier as they'll have the tools and bits needed. However:

    1) Are you actually plugging the cables into the components? Using the proper Shimano tool until they click? A friend who travelled a lot with their bike was having weird Di2 issues caused by the seatpost battery cable being inserted by hand and not 'clicked' into place. Check all the connections, including the junction boxes (yes, even the one buried in your frame)
    2) If you have not used a SM-PCE01 to test individual components then now is the time to do so. My guess is that they'll all come back green.
    3) Inspect all the cables for a kink etc. The seatpost battery cable is generally the worst.
    4) If your battery is the original black one (not the newer purple) then swap the battery for a new one.
    5) Time to start swapping components. If you have access to an entire wiring loom then plug it all in now, leaving the cables draped externally if needed.
    6) Replace both the A and B junction boxes
    7) Curse and swear and start replacing individual shifters and derailleurs.

    You're 'lucky' that the charge is being lost consistently and rather quickly so you *should* be able to isolate the leak by checking (and recording) how much charge is lost in 24h for each unplugged component.

  9. #9
    Join Date
    Jul 2013
    Location
    Colorado
    Posts
    226
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default Re: Di2 battery not holding charge

    Iíve seen a few ew90 stem mounted junction boxes go haywire recently and start eating battery life but I havenít seen it on the rs-910. How do you have the cables routed? Were the bars pre drilled for the bar end junction or did you modify them? Wires going through stem or anything extra fancy like that?
     

  10. #10
    Join Date
    Jun 2015
    Location
    Belgium
    Posts
    799
    Post Thanks / Like
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)

    Default Re: Di2 battery not holding charge

    Quote Originally Posted by bdaghisallo View Post
    After swapping out the battery didn't solve my issue, I swapped out the junction box and the problem was solved.
    Lucky discovery!
    Chikashi Miyamoto

  11. #11
    Join Date
    Jun 2015
    Location
    Belgium
    Posts
    799
    Post Thanks / Like
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)

    Default Re: Di2 battery not holding charge

    Quote Originally Posted by watchcwgo View Post
    I’ve seen a few ew90 stem mounted junction boxes go haywire recently and start eating battery life but I haven’t seen it on the rs-910. How do you have the cables routed? Were the bars pre drilled for the bar end junction or did you modify them? Wires going through stem or anything extra fancy like that?
    The bars are not modified; it's a Pro Vibe Di2 compatible thingy.

    I did not opt for the Vibe stem, so no fancy wiring. wire comes out of the bar and enters the frame at the side of the head tube. Therefore, if a kink in the wire is the cause, it would likely be where it's visible, outside the bars / frame. But I can't spot one.
    Chikashi Miyamoto

  12. #12
    Join Date
    Jun 2015
    Location
    Belgium
    Posts
    799
    Post Thanks / Like
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)

    Default Re: Di2 battery not holding charge

    Quote Originally Posted by Tristan View Post
    Well Di2 is amazing and always works perfectly. Until it doesn't.
    Ain't that the troof.

    Quote Originally Posted by Tristan View Post
    Unfortunately you're in a tough position and this is where a good bike shop should earn their money as they're able to diagnose and test quicker and easier as they'll have the tools and bits needed. However:

    1) Are you actually plugging the cables into the components? Using the proper Shimano tool until they click? A friend who travelled a lot with their bike was having weird Di2 issues caused by the seatpost battery cable being inserted by hand and not 'clicked' into place. Check all the connections, including the junction boxes (yes, even the one buried in your frame)
    2) If you have not used a SM-PCE01 to test individual components then now is the time to do so. My guess is that they'll all come back green.
    3) Inspect all the cables for a kink etc. The seatpost battery cable is generally the worst.
    4) If your battery is the original black one (not the newer purple) then swap the battery for a new one.
    5) Time to start swapping components. If you have access to an entire wiring loom then plug it all in now, leaving the cables draped externally if needed.
    6) Replace both the A and B junction boxes
    7) Curse and swear and start replacing individual shifters and derailleurs.

    You're 'lucky' that the charge is being lost consistently and rather quickly so you *should* be able to isolate the leak by checking (and recording) how much charge is lost in 24h for each unplugged component.
    1) Yes, clicked in with that toothpick thingy -- bar end junction, RD and battery. I haven't checked the ones buried in the bike.
    2) I don't have SM-PCE01, but I am hoping my LBS has a SM-PCE02 so they can check on the battery as well.
    3) Seatpost battery wire looks fine. All external sections have no kinks. I don't believe there is a reason for internal sections to have developed a kink, but I suppose it doesn't mean that it was kinked in the beginning and the symptoms are showing up only now.
    4) I'm not familiar with the purple one. (We're usually a bit slow over here.) The model number I have is BT-DN110.

    If I had an extra bit of wire, I suppose I could connect the battery directly to, eg, RD and see if one of them has gone rogue. But I don't.
    Hmmm...
    Chikashi Miyamoto

  13. #13
    Join Date
    Jun 2008
    Location
    Bermuda
    Posts
    1,422
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default Re: Di2 battery not holding charge

    Quote Originally Posted by Chik View Post
    Lucky discovery!
    It helped that it was by far the easiest thing to check next after swapping batteries!
     

  14. #14
    Join Date
    Jun 2015
    Location
    Belgium
    Posts
    799
    Post Thanks / Like
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)

    Default Re: Di2 battery not holding charge

    I think I will fully charge the battery again, disconnect it from the system, then reconnect it after 5 days to see how much charge is remaining. If I find that it's dead, then it's the battery. If not, I'll have to diagnose other bits one way or another.
    Chikashi Miyamoto

  15. #15
    Join Date
    Jun 2015
    Location
    Belgium
    Posts
    799
    Post Thanks / Like
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)

    Default Re: Di2 battery not holding charge

    I left the battery disconnected for a week, cleaned the tips with alcohol, plugged it back in, and saw that it held its charge. The battery is still good.

    I unplugged the RD, cleaned the tips with alcohol, plugged it back in. No visible contamination on the Q-tip.

    I did the same with the FD. I somehow forgot to unplug and re-plug the FD last time. No visible contamination on the Q-tip.

    It's been 10 days since I plugged the battery back in, 16 days since the last charge. Solid green light at the junction box.

    So, I think the FD plug may have been a bit loose and caused a drain. Is that possible?

    Toots, I haven't had a chance to get some di-electric grease, but given that the plugs are very small, we're talking about a miniscule amount when applying, correct?
    Chikashi Miyamoto

  16. #16
    Join Date
    Jan 2009
    Location
    Wellington, New Zealand
    Posts
    2,453
    Post Thanks / Like
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)

    Default Re: Di2 battery not holding charge

    Quote Originally Posted by Chik View Post

    So, I think the FD plug may have been a bit loose and caused a drain. Is that possible?
    Most definitely - they can ovalise with lots of wiggling. It's also worth always using the Shimano tool to unplug and re-plug the connectors.

Similar Threads

  1. Charge you cell phone at your desk...while pedaling
    By rwsaunders in forum General Discussion
    Replies: 5
    Last Post: 12-05-2014, 08:49 AM
  2. Charge Juicer
    By Der_kruscher in forum General Discussion
    Replies: 5
    Last Post: 01-26-2012, 10:49 PM
  3. a different handling of a doping charge?
    By gt6267a in forum General Discussion
    Replies: 12
    Last Post: 10-22-2009, 08:50 PM
  4. The reflex is in charge...
    By AntLockyer in forum General Discussion
    Replies: 19
    Last Post: 05-23-2009, 09:40 AM
  5. Hampco has been holding out on us again!
    By davyt in forum General Discussion
    Replies: 1
    Last Post: 05-12-2009, 01:18 PM

Tags for this Thread

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •