dvrman
Flying officer
Posts: 6
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Post by dvrman on Jan 7, 2016 18:53:37 GMT 1
Hey all - having an issue with one of my lipos when trying to charge/balance it with my accucell 6 charger. It just started doing this thing when I charge it; the voltage readings for each cell, while charging, are fluctuating all over the place. Any given cell's voltage will go anywhere from 0v all the way up to 7.2v and will never stabilize and land on the actual voltage of each cell. Usually, when charging correctly, each of the 3 cells reads about 3.8 volts and then finishes the charging when they all balance out and reach 4.2 volts. Seems to me like the battery is failing, or maybe just the balancing plug is bad, not sure. Has anyone seen this type of random voltage fluctuation before? FYI, I have other batteries that charge fine with this charger.
Zippy 2200mah 3s 20C
Thanks!
Dan
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Post by sham on Jan 7, 2016 19:57:16 GMT 1
I'd be discarding that battery and never attempting another charge, personally.
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dvrman
Flying officer
Posts: 6
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Post by dvrman on Jan 7, 2016 20:53:16 GMT 1
Yeah, I'm pretty close to doing that  Just was curious if anyone has ever had this issue and what could be the possible cause. Dan |
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dvrman
Flying officer
Posts: 6
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Post by dvrman on Jan 8, 2016 17:20:19 GMT 1
Found out what happened, in case it happens to anyone else.
One of the 4 wires that are part of the balancing wire harness came disconnected and I didn't notice. It also just happened to another one of my Zippys today and its now doing the same thing. Wonder if this is a flaw with this lot of Zippys since it happened with the white wire on both. Who knows...
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Post by flydiver on Jan 8, 2016 20:59:35 GMT 1
Some batteries, or some batteries sometimes have pretty lousy balance wires. There are limited number of cell manufacturers, most being assemblers and the quality of the assembly AND the sourcing of the cells can change. So, a good brand one time can be not so good 6 months later.
I've learned to fasten the balance wires with some tape so they don't get worked at the solder junction. Some people use hot glue, but I think that could cause other problems. Certainly try not to yank on those wires. Which wire breaks is almost random. If you have a pack that broke a wire I'd suspect ALL the wires on that pack to be fragile.
With care you can open it up, figure out where it came off, and solder it back on.
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dvrman
Flying officer
Posts: 6
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Post by dvrman on Jan 9, 2016 2:33:04 GMT 1
Thanks flydiver, good info. After making my last post I did find a nice video on how to make the solder joints again. Nice to know that the batteries may still be salvageable Dan |
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Post by flydiver on Jan 9, 2016 4:26:17 GMT 1
Great. Move cautiously and deliberately. A short involving lipos tends to make a lot of fireworks and unwamted excitement.
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dvrman
Flying officer
Posts: 6
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Post by dvrman on Jan 9, 2016 18:06:49 GMT 1
I know, I've seen the videos  Nothing to play around with. I will be very careful. Thanks again |
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dvrman
Flying officer
Posts: 6
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Post by dvrman on Jan 10, 2016 0:02:03 GMT 1
Progress report... Carefully cut my way in to the board and soldered the white wire back on both lipos. They both balance out fine now |
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Just was curious if anyone has ever had this issue and what could be the possible cause.
Nothing to play around with. I will be very careful. Thanks again