Batteries & Chargers Discuss Li-P, Li-Ion, NiMh, Nicad battery technology and the chargers that juice 'em up!

balance plug shows voltage-no power out of main leads

Old 06-19-2011, 10:31 PM
  #1  
crashalot
New Member
Thread Starter
 
Join Date: Jun 2011
Location: Stouffville,ON
Posts: 2
Default balance plug shows voltage-no power out of main leads

I burned up a speed control in flight today and it had a strange effect on one of my batteries. I lost power from the main leads that go to the speed control but when I check the individual cells there is still 3.75V there.

I am using 2 x 3cell 3700mah 25C batteries in paralel for 22V total output.
only one of the batteries was affected,but it shut down all power from the lipos.....

Any ideas what is going on here? can I get the power leads connected up again??

No - the plane didn't crash - I have a seperate power system for receiver and flight surfaces !! Thank goodness...... was able to dead stick in
crashalot is offline  
Old 06-19-2011, 10:41 PM
  #2  
CHELLIE
Super Contributor
 
CHELLIE's Avatar
 
Join Date: Oct 2006
Location: Hesperia, So. Calif
Posts: 19,273
Default

Originally Posted by crashalot View Post
I burned up a speed control in flight today and it had a strange effect on one of my batteries. I lost power from the main leads that go to the speed control but when I check the individual cells there is still 3.75V there.

I am using 2 x 3cell 3700mah 25C batteries in paralel for 22V total output.
only one of the batteries was affected,but it shut down all power from the lipos.....

Any ideas what is going on here? can I get the power leads connected up again??

No - the plane didn't crash - I have a seperate power system for receiver and flight surfaces !! Thank goodness...... was able to dead stick in
you will have to open the battery up, you may have burned up a safety tab fuse that connects all the lipo cells together, or a battery lead that attaches to the lipos burnt off. some times you can repair a lipo and sometimes you cant, the tabs are fused on and the metal looks like aluminum so you cant solder it. anyway lipos are cheap Take care and have fun, Chellie
CHELLIE is offline  
Old 06-20-2011, 09:09 AM
  #3  
slipstick
Super Contributor
 
Join Date: Oct 2005
Location: N.Staffs, UK
Posts: 2,350
Default

I think you mean 2 x 3S batteries in SERIES not parallel. In series any break in connection anywhere in the series chain will lose all the power.

It's quite possible that one power lead has simply come disconnected but as Chelly says it may not be that easy to put it back together....depends on the battery and how it was originally constructed.

Steve
slipstick is offline  
Old 06-20-2011, 11:33 AM
  #4  
crashalot
New Member
Thread Starter
 
Join Date: Jun 2011
Location: Stouffville,ON
Posts: 2
Default

Thank you Chellie and Slipstick - I opened up the lipo and the + wire had disconnected - a careful resoldering has solved the problem and the battery is ready to fly again.

Slipstick, you are so right, the 2 3 cells are connected in *series* and it is apparent that my spelling is not too great either..........

Now all I have to do is figure out what caused the speed control to expire in mid flight . I was only cruising at 1/3 throttle.

Thanks again - very helpfull....

Craig
crashalot is offline  
Old 06-20-2011, 11:39 AM
  #5  
CHELLIE
Super Contributor
 
CHELLIE's Avatar
 
Join Date: Oct 2006
Location: Hesperia, So. Calif
Posts: 19,273
Default

Originally Posted by crashalot View Post
Thank you Chellie and Slipstick - I opened up the lipo and the + wire had disconnected - a careful resoldering has solved the problem and the battery is ready to fly again.

Slipstick, you are so right, the 2 3 cells are connected in *series* and it is apparent that my spelling is not too great either..........

Now all I have to do is figure out what caused the speed control to expire in mid flight . I was only cruising at 1/3 throttle.

Thanks again - very helpfull....

Craig
Hi Craig put a wattmeter on it, that will tell the story, use a ESC thats 25% bigger than what you have now, also check to see that you have pleanty of air flow through the Fusalage to cool the electronics, also check the motor to make sure that its not shorted out, all 3 wires should have the same ohm reading, and none of the wires should show any reading when a wire and the test lead is touched to the motor body, Take care and have fun, Chellie

BTW Glad you were able to repair your lipo

http://www.wattflyer.com/forums/showthread.php?t=35216
CHELLIE is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
AEAJR
Beginners
166
11-02-2021 01:03 PM
Tim Marks
FMA Direct
63
09-21-2012 05:09 AM
bsrchas
Batteries & Chargers
14
04-19-2011 05:56 PM
Henry111
Batteries & Chargers
118
03-18-2011 06:27 PM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Quick Reply: balance plug shows voltage-no power out of main leads


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.

Page generated in 0.08720 seconds with 13 queries