HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Oct 14, 2012, 08:15 AM
Registered User
Joined Mar 2012
88 Posts
Quote:
Originally Posted by RC Man View Post
Donít try to use your multi meter to measure internal resistance that will burn out your meter. Thatís the biggest mistake that some beginners make.



.
Thanks but I'm not excactly sure what you mean, and I read this after trying out my multi meter.

I bought a very cheap UNI-T UT33D

I set it to 200m first because I wasn't sure...
Then I put the red cable to the red on the battery and black to black and it showed around 04.5.
Red to black and black to red and I got around -05,0.
kjur is offline Find More Posts by kjur
Reply With Quote
Sign up now
to remove ads between posts
Old Oct 14, 2012, 09:10 AM
Registered User
tacx's Avatar
United States, MI, Macomb
Joined Apr 2009
2,555 Posts
The polarity is correct on the batteries, but you need to set the meters voltage range to the 20V position. Let us know what reading you get at that setting.

If you read only 4.5 volts your batteries are way to low and that is why the charger will not charge them.

Youir charger recognizes your batteries cell count and voltage by the voltage it reads when you plug the battery into it. If it is to low it will not go into charge mode and you will get a message similar to what you got in the beginning. Basiclly, what is happening is your charger is set to charge a 3 cell battery, but it is only detecting a one cell battery, so it will not go into charge mode cause it thinks you have the wrong battery plugged in.

If your batteries are infact that low they may be ruined or at the very least they will have a short life.

If you shorted out the wires when you were replacing the connectors that could be the reason for the low voltage.

You can try manualy charging on your chargers Nicad settings, without plugging in the balance connector, to bring the batteries up to about 9 volts, and then switching to the Lipo Balance charge and see if the charger will complete the charge.

BE AWARE !! If you try this you need to constantly monitor the Nicad charge so the voltage just gets to about 9 volts.

There are some threads that may explain this in detail for your particular charger and if you are not that familiar with battery charging you should do some searching and read up on doing this.

Try this sticky.

http://www.rcgroups.com/forums/showthread.php?t=1074181
tacx is offline Find More Posts by tacx
Last edited by tacx; Oct 14, 2012 at 12:13 PM.
Reply With Quote
Old Oct 14, 2012, 09:38 AM
Space Coast USA
hoppy's Avatar
Space Coast
Joined Oct 2000
20,911 Posts
I 'm sure he meant 20V and not 20A. If you put it on 20A you will blow the fuse in your meter.
Set it on the 20 range in the V section. You have it now set on 2000 millivolts or 2V.

With the meter on the 200m or 200 millivolt range, a reading of 4.5 is 4.5mv, not volts. You have an open somewhere in your wiring to the battery.

Let us know what it reads with the meter in the 20V section.
hoppy is offline Find More Posts by hoppy
Last edited by hoppy; Oct 14, 2012 at 09:59 AM.
Reply With Quote
Old Oct 14, 2012, 12:15 PM
Registered User
tacx's Avatar
United States, MI, Macomb
Joined Apr 2009
2,555 Posts
hoppy, thanks for the correction. Sometimes type faster than I think ! Edited my respose.
tacx is offline Find More Posts by tacx
Reply With Quote
Old Oct 14, 2012, 01:21 PM
Registered User
Joined Mar 2012
88 Posts
I set it to 20V and tested on both batteries and it reads 0.01. I then tried it on my other lipos and they are around 12.55.
kjur is offline Find More Posts by kjur
Reply With Quote
Old Oct 14, 2012, 01:26 PM
Space Coast USA
hoppy's Avatar
Space Coast
Joined Oct 2000
20,911 Posts
Check voltage at balance connector. On the top of the connector you will see slots and metal down in them. Carefully touch one probe to the first slot and the other to the last slot. You should see 11.XX volts. What do you get? If tips are too big to get into slot, tape a small wire to the probe tip and tape it on so that only a little bit of metal is showing on the end.

Be careful not to let the probes touch each other or kabam!!! short.
hoppy is offline Find More Posts by hoppy
Last edited by hoppy; Oct 14, 2012 at 01:39 PM.
Reply With Quote
Old Oct 14, 2012, 02:38 PM
Registered User
Joined Mar 2012
88 Posts
Okay I did what you said but it still reads 0.01 or 0.00.
If it makes a difference I also tried to touch one probe to the red wire on the MPX and the other to all the slots on the balance connector, and when I touch the yellow one it reads 3.80.
kjur is offline Find More Posts by kjur
Reply With Quote
Old Oct 14, 2012, 03:09 PM
Space Coast USA
hoppy's Avatar
Space Coast
Joined Oct 2000
20,911 Posts
The balance connector has 4 wires. Measure (carefully) 1 & 2, 2 & 3, 3 & 4. What do you get. Make sure the probes are touching the metal inside the connector and don't let them touch each other.
hoppy is offline Find More Posts by hoppy
Reply With Quote
Old Oct 14, 2012, 03:23 PM
Registered User
Joined Mar 2012
88 Posts
With red touching red and black touching yellow I get 3.87.
Black touching black, red on white 3,86.
kjur is offline Find More Posts by kjur
Reply With Quote
Old Oct 14, 2012, 04:01 PM
Space Coast USA
hoppy's Avatar
Space Coast
Joined Oct 2000
20,911 Posts
Put that in terms of 1, 2, 3, and 4. Just to be sure, that would be one probe in slot one and the other in slot 2. and so forth Just move the probes down one pin at a time.
1-2 ?V
2-3 ?V
3-4 ?V
hoppy is offline Find More Posts by hoppy
Last edited by hoppy; Oct 14, 2012 at 04:17 PM.
Reply With Quote
Old Oct 14, 2012, 05:02 PM
A man with too many toys
United States
Joined Feb 2001
17,622 Posts
Sounds like a bad solder joint or the new connectors you soldered on could be defective.
RC Man is offline Find More Posts by RC Man
Reply With Quote
Old Oct 14, 2012, 06:06 PM
Space Coast USA
hoppy's Avatar
Space Coast
Joined Oct 2000
20,911 Posts
Quote:
Originally Posted by kjur View Post
With red touching red and black touching yellow I get 3.87.
Black touching black, red on white 3,86.
To test the main power leads, push a needle through the insulation of the red lead near the connector. Push another needle through the wire insulation on the black wire near the battery. It doesn't matter exactly, you just don't want them to accidently touch one another. Measure the voltage here. If it's 11.xx something, resolder your connectors. One or both of them is not connected.
hoppy is offline Find More Posts by hoppy
Reply With Quote
Old Oct 15, 2012, 10:02 PM
Space Coast USA
hoppy's Avatar
Space Coast
Joined Oct 2000
20,911 Posts
Kjur,

What's happening?
hoppy is offline Find More Posts by hoppy
Reply With Quote
Old Oct 15, 2012, 10:34 PM
Frankenstein recycled packs
rampman's Avatar
USA, AZ, Gilbert
Joined Jan 2006
8,774 Posts
(DELETED)
Good luck on this. The probes through the insulation is a must at this time.
Rick
rampman is offline Find More Posts by rampman
Reply With Quote
Old Oct 17, 2012, 04:48 AM
A man with too many toys
United States
Joined Feb 2001
17,622 Posts
Did you figure out what the problem was?
RC Man is offline Find More Posts by RC Man
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Question Brand-New DX8 Won't Hold a Charge banzi28 Radios 64 Aug 11, 2012 09:31 AM
Discussion PowerLab 8 won't auto discharge after charge (won't cycle) martinwinlow FMA Direct 6 Apr 08, 2012 05:26 AM
Discussion New thunder power 250 mah 2cell lipo 20c i think problem charging (won't charge) GreenAce92 Batteries and Chargers 24 Jan 27, 2010 06:17 PM
Rant New LiPo Pack Won't Charge??? Frothingslosh Batteries and Chargers 3 Oct 22, 2004 01:23 PM
Why won't my brand new NiMH Aerohawk batteries charge correctly? ucsdgemini Batteries and Chargers 14 Mar 13, 2004 07:21 PM