image
Results 1 to 9 of 9

Thread: Battery Question

  1. #1
    Navigator CongoSavanne's Avatar
    Join Date
    Feb 2016
    Posts
    529

    Battery Question

    I have two 6 cell batteries from the same manufacturer.
    They work fine except on both, cells 5 and 6 never balance correctly.
    1 through 4 = 3.80 but cell 5 will be ~3.93 and cell 6 will be 3.75, it's the same for both, this is on a Powerlab6 and a TB6AC.

    Any thoughts?
    “Birds born in a cage think flying is an illness.”
    - Alejandro Jodorowsky

    Last edited by doobie; 15th August 2016 at 10:26 PM. Reason: spelt titties wrong

  2. #2
    Navigator
    Join Date
    Dec 2014
    Posts
    28
    Chargers don't usually balance when in storage mode, which is what I am guessing you're doing if you're charging to 3.8.

  3. #3
    Navigator CongoSavanne's Avatar
    Join Date
    Feb 2016
    Posts
    529
    Quote Originally Posted by joshuabardwell View Post
    Chargers don't usually balance when in storage mode, which is what I am guessing you're doing if you're charging to 3.8.
    Yeah it gives that impression, but even after a full charge and running balance cells 5 and 6 are off enough to worry me.
    “Birds born in a cage think flying is an illness.”
    - Alejandro Jodorowsky

    Last edited by doobie; 15th August 2016 at 10:26 PM. Reason: spelt titties wrong

  4. #4
    Navigator Beachflyer's Avatar
    Join Date
    Mar 2013
    Location
    Orange Beach, AL.
    Posts
    935
    I would try charging the cells separately. If you do a balance charge for instance and cell 5 and 6 are considerably different(high or low) then charge or discharge each cell till it matches the others. If this doesn't help after a few times i'd ditch the battery.
    Ill send a pic of the harness i use in a bit.

  5. #5
    Navigator Beachflyer's Avatar
    Join Date
    Mar 2013
    Location
    Orange Beach, AL.
    Posts
    935
    Here is the harness I use for individual cell adjustment.
    Click image for larger version. 

Name:	image.jpg 
Views:	94 
Size:	387.0 KB 
ID:	71584Click image for larger version. 

Name:	image.jpg 
Views:	89 
Size:	426.0 KB 
ID:	71585

  6. #6
    Navigator
    Join Date
    Dec 2014
    Posts
    28
    Quote Originally Posted by CongoSavanne View Post
    Yeah it gives that impression, but even after a full charge and running balance cells 5 and 6 are off enough to worry me.
    Why does the charger stop the cycle if the cells aren't full?

  7. #7
    Navigator CongoSavanne's Avatar
    Join Date
    Feb 2016
    Posts
    529
    Quote Originally Posted by joshuabardwell View Post
    Why does the charger stop the cycle if the cells aren't full?
    2 different chargers get the same (almost) exact result, so I don't know is the only answer I can give.
    “Birds born in a cage think flying is an illness.”
    - Alejandro Jodorowsky

    Last edited by doobie; 15th August 2016 at 10:26 PM. Reason: spelt titties wrong

  8. #8
    Navigator CongoSavanne's Avatar
    Join Date
    Feb 2016
    Posts
    529
    Quote Originally Posted by Beachflyer View Post
    Here is the harness I use for individual cell adjustment.
    Click image for larger version. 

Name:	image.jpg 
Views:	94 
Size:	387.0 KB 
ID:	71584Click image for larger version. 

Name:	image.jpg 
Views:	89 
Size:	426.0 KB 
ID:	71585
    Thanks, that a good idea I'll try it.
    “Birds born in a cage think flying is an illness.”
    - Alejandro Jodorowsky

    Last edited by doobie; 15th August 2016 at 10:26 PM. Reason: spelt titties wrong

  9. #9
    Navigator CongoSavanne's Avatar
    Join Date
    Feb 2016
    Posts
    529
    OK here's the good news, I got a new battery tester and it turns out the batteries are fine, they were balanced, the only mystery now is why the old tester showed bad cells on 5 and 6.
    Thanks for the help guys.
    “Birds born in a cage think flying is an illness.”
    - Alejandro Jodorowsky

    Last edited by doobie; 15th August 2016 at 10:26 PM. Reason: spelt titties wrong

Similar Threads

  1. Battery question
    By Zappy in forum ReadyMadeRC
    Replies: 0
    Last Post: 16th March 2015, 11:41 AM
  2. RMRC battery question.
    By ElectricEvan369 in forum RMRC Support
    Replies: 6
    Last Post: 27th July 2014, 11:51 PM
  3. TBS ZII battery bay question
    By S0YL3NT in forum Team-Black Sheep
    Replies: 4
    Last Post: 22nd June 2014, 12:57 PM
  4. Battery question
    By john1943 in forum Fat Shark R/C Vision Systems
    Replies: 4
    Last Post: 25th May 2014, 08:27 AM
  5. FPV 25C Battery Newbie Question
    By FallenD in forum RC TECH
    Replies: 5
    Last Post: 20th August 2013, 12:40 PM

Posting Permissions

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