Wish
DX  » Community » Forums
«See all threads (in Product Forum)
Product Forum

Latest batch is bad

  • cyclist Moderator Wednesday, December 7, 2011 6:44 AM Reply
    Ive got two pairs and have only fully tested one pair so far, and those results are basically the same as yours BIBIwood! Far from the claimed True 2400.

    I did do a quicky test with one off the others and came back with just over 1200, but will do a few more charge/discharge cycles before i get really annoyed with that one!

    I have never bought these before so can't compare but, the wrapping on the pair i am testing is a bit rubbish. By that, i mean that its not smooth and quite bumpy, where the other pair is fine. I don't know if that means anything to anyone?
    Flashlight issues~https://tinyurl.com/bw2d3pd
    DX Return Policy/Warranty~https://tinyurl.com/yb7dpg3s
    New customers read this ~ http://tinyurl.com/3kcyfqm
    Tracking site ~ http://www.17track.net/en
    Posts(17129) | Reviews | Tip post

  • desolder Top 10 Forum Poster Wednesday, December 7, 2011 10:40 AM Reply
    @BIBIwood - you'll need to turn off or extend the security timer so it will terminate naturally and achieve full charge.
    What's up with the scrubbed LED driver IC markings?
    What are they trying to hide?

    Posts(7073) | Reviews | Tip post

  • sheepish Top 10 Forum Poster Wednesday, December 7, 2011 4:09 PM Reply
    OK, as suggested by CSE I did have a look through the forum and found a few capacities for discharge capacities, mostly down to 3.0V. It seems that the capacities I got are at the lower end of the range for the old cells, which were consistently very good.

    sheepish: 2301, 2300 mAh.
    @manne: ~2370, ~2425 mAh (from graph).
    @adskoezlo: 2326, 2345, 2576, 2337, 2373, 2360, 2270, 2435 mAh.
    @DrJones: 2421, 2499 mAh (at 2A down to 2.9V).

    Capacities for the new cells as mentioned in this thread are all consistently lower than for the old cells, but only partly consistent with each other.

    sheepish: 990(!), 1845 mAh.
    desolder: 2148 mAh.
    BIBIwood: 1846 mAh.
    cyclist: ~1846, ~1846, 1200+ mAh (further testing pending).

    cyclist, when I took the photo comparing the heights of the two new cells the ends seemed to be on an angle and the white ring around the positive terminal didn't want to stay stuck down.
    Remembering 30 years.
    Posts(24945) | Reviews | Tip post

  • BIBIwood Geek And Interns Thursday, December 8, 2011 2:20 AM Reply
    And some results on older sample which were shipped during the summer:

    Discharge @1A and terminaison voltage of 3V:

    http://s8.postimage.org/bh3mnt8ro/dsg_Old.jpg
    img src: http://s8.postimage.org/bh3mnt8ro/dsg_Old.jpg



    Charge @1A:

    http://s8.postimage.org/csu7ymeuc/chgold.jpg
    img src: http://s8.postimage.org/csu7ymeuc/chgold.jpg



    Need to do a charge on a the current shipment but without the security timer to be sure.
    Posts(609) | Reviews | Tip post

  • sheepish Top 10 Forum Poster Thursday, December 8, 2011 3:00 AM Reply
    BIBIwood you really do need to work on your image embedding. How used was that cell? Was it missing the crossed out rubbish bin symbol? If the cell was charged at 1A for a total 2161mAh, the charger can't have stopped at 2 hours.

    Apparently you're handling the protection circuit issue as well.
    Remembering 30 years.
    Posts(24945) | Reviews | Tip post

    post edited by sheepish on 12/8/2011 at 3:01 AM
  • BIBIwood Geek And Interns Thursday, December 8, 2011 3:11 AM Reply

    For the protection timer I was talking about the pictures i posted previous page, first time I used this charger so the default parameters were to stop the charge after 120 minutes.
    So I need to redo the test with a complete charge to be sure that I have the correct values.
    For this test and pictures, as you can see I turned this feature off, so the charge is complete in 191 minutes.

    Do you know how to see if the protection circuit works well on the battery ? My charger go down only to 3V.
    Posts(609) | Reviews | Tip post

  • sheepish Top 10 Forum Poster Thursday, December 8, 2011 3:33 AM Reply
    Ah, a challenge almost as entertaining as sece's desert island survival competition.

    Put sku.44718 in parallel with each other and attach to sku.100999 using sku.66137 (Chinese plug) and sku.66837. Clip sku.48816 (comes with clips) onto it so you can see what's happening. Turn the knob 1 click anti-clockwise from off. Then get ready to plug sku.20392 into sku.100999.

    When you do that, the bad cells will basically go straight down in just a minute or two. The good cells might take about ten minutes. (Judging from what they did after passing through 3.0V in my own tests.)
    Remembering 30 years.
    Posts(24945) | Reviews | Tip post

    post edited by sheepish on 12/8/2011 at 4:13 AM
  • BIBIwood Geek And Interns Thursday, December 8, 2011 8:30 PM Reply

    Ahah nice suggestion, but I'm not sure I really want to use a cheap DX soldering iron when I use a Weller one back home ;)
    Posts(609) | Reviews | Tip post

  • sheepish Top 10 Forum Poster Thursday, December 8, 2011 10:19 PM Reply
    Are you saying this test might take a while, until you get home? LOL.

    How about sku.91478 with sku.68135 or the cable from sku.15996?

    Or take an alternative approach and just clamp the probes and sku.44718 leads onto the cell with sku.1160 - "Can carry all kind of devices".
    Remembering 30 years.
    Posts(24945) | Reviews | Tip post

  • BIBIwood Geek And Interns Sunday, December 11, 2011 8:54 PM Reply
    So I did more test on the new batch:

    Discharge @1A and terminaison voltage of 3V:

    http://s8.postimage.org/ypws5kr8k/dscnew2.jpg
    img src: http://s8.postimage.org/ypws5kr8k/dscnew2.jpg



    Charge @1A:

    http://s12.postimage.org/b4x9xr1jw/chgnew2.jpg
    img src: http://s12.postimage.org/b4x9xr1jw/chgnew2.jpg



    Hum a little bit better but still far from what it should be.
    Posts(609) | Reviews | Tip post

Page 3 of 20
Go to Page:
«Reply to this thread (in Product Forum)
Product Forum

Reply

Subject:

* 50 characters max

Message:

Please note: HTML codes are not allowed anywhere on this page (otherwise you will see an error).

Please note that DealExtreme Forums are not a sales or product support board. While we do constantly participate in this forum, please contact us via support ticket for a guaranteed fast response. We make every effort to make the quickest replies.

DX Everywhere