RunRyder RC
 9  Topic Subscribe
WATCH
 2 pages [ <<    <    ( 1 )     2     NEXT    >> ] 932 views POST REPLY
Scorpion Power Scorpion Power
HelicopterMain Discussion › Puffed lipo while connecting to esc
02-22-2017 02:21 AM  6 months agoPost 1
yongary

rrApprentice

Manchester, NH

My Posts: All  Forum  Topic

All my lipo batteries have hxt 4mm connector (I believe) and I have been using the deans connector since the esc had the deans connectors on it. I had no problems with them so far.

I recently got a new esc and it has the XT90 connectors on it so I ordered this connector from ebay (http://www.ebay.com/itm/HXT-4MM-Bul...%3D381877318596) and connected it to my lipo and plugged into the new esc.

As soon as I plugged them in (2 x 3S Turnigy 4000mah lipo), the smoke came out of the connectors and puffed the lipos. I immediately removed the connectors but they were already melted. It was really HOT!

I would like to know what I have done wrong. Did I buy the wrong connector?

Should I have bought this instead? (http://www.ebay.com/itm/DIRECT-CONN...iMAAOSw4GVYSKzn)

The lipo batteries are puffed so I don't want to use them anymore (too risky I guess) but what about the new esc? Did I ruin it as well?

Please advise.

PM  EMAIL  GALLERY  Attn:RR
02-22-2017 02:51 AM  6 months agoPost 2
yongary

rrApprentice

Manchester, NH

My Posts: All  Forum  Topic

Mistake

Ok, I made a stupid mistake. Red to Black, Black to Red.. Wrong adapter..

PM  EMAIL  GALLERY  Attn:RR
02-22-2017 02:52 AM  6 months agoPost 3
wrongler

rrProfessor

Brewerton, New York

My Posts: All  Forum  Topic

My guess, they may have been wired backwards.

Bill Whittaker

PM  EMAIL  GALLERY  Attn:RR
02-22-2017 02:53 AM  6 months agoPost 4
wrongler

rrProfessor

Brewerton, New York

My Posts: All  Forum  Topic

You beat me buy 1 minute.

Bill Whittaker

PM  EMAIL  GALLERY  Attn:RR
02-22-2017 03:56 AM  6 months agoPost 5
ant_mb

rrElite Veteran

United States

My Posts: All  Forum  Topic

Polarity should be the first thing you check. Especially if you have a problem, first thing I would have checked before typing a lengthy message is the red and black!

PM  EMAIL  GALLERY  Attn:RR
02-22-2017 05:29 AM  6 months agoPost 6
yongary

rrApprentice

Manchester, NH

My Posts: All  Forum  Topic

Lipo 101

I have been out of the hobby for more than 10 years and I must have forgotten the basics of lipo batteries. Good lesson for me.

PM  EMAIL  GALLERY  Attn:RR
02-22-2017 08:00 PM  6 months agoPost 7
Ladymagic

rrKey Veteran

South Korea

My Posts: All  Forum  Topic

I am not 100% sure but, it looks like you made an adapter to allow you to use two different connector types.

Wouldn't it have been easier to just solder in a matching connector one of the ends which intern, would have saved your battery?

just askin

Mellisa

PM  EMAIL  GALLERY  Attn:RR
02-22-2017 09:09 PM  6 months agoPost 8
yongary

rrApprentice

Manchester, NH

My Posts: All  Forum  Topic

Soldering 101

That's what I am going to learn next. By the way, it's nice seeing someone from South Korea. I was born and raised there

PM  EMAIL  GALLERY  Attn:RR
02-23-2017 01:54 AM  6 months agoPost 9
utahbob

rrVeteran

St. George Utah

My Posts: All  Forum  Topic

I think it was Ole Ben Franklin who said..

Oh S@#t!! That hurts!..remember this mantra..Red to black and black to red..can make ya dead! sorry about your pack..we all learn these hard lessons!

I do a great decending funnel!

PM  EMAIL  GALLERY  Attn:RR
02-23-2017 09:28 PM  6 months agoPost 10
artimus

rrKey Veteran

Buckley WA

My Posts: All  Forum  Topic

Think of it as paying tuition....because you got schooled.
I am willing to bet you wont make that mistake again.

Fly Hard......Team Viagra

PM  EMAIL  GALLERY  Attn:RR
02-24-2017 02:38 PM  6 months agoPost 11
Ladymagic

rrKey Veteran

South Korea

My Posts: All  Forum  Topic

That's what I am going to learn next.
Got it. Makes perfect sense now.

Yes, good soldering is definitely worth learning. I learned a couple of years ago and before I did, I was bugging people to do the work for me, but they would usually only do it on their own time and sometimes they didn't do such a good job.

It took a few tries, but now that I learned, I solder everything....sometimes soldering things for no real reason other than because I can.

All you need is a good soldering station and some old connectors and wires to practice on. Just try not to practice on your good stuff.

Mellisa

PM  EMAIL  GALLERY  Attn:RR
02-24-2017 03:23 PM  6 months agoPost 12
Pistol Pete

rrProfessor

Seffner, FL

My Posts: All  Forum  Topic

but what about the new esc? Did I ruin it as well?
IF the ESC has reverse polarity protection, then it's fine.

Unfortunately the only way to find out if it's unknown if it does have such protection is to plug a battery to it.

~~Enjoying the hobby one flight at a time~~

PM  EMAIL  HOMEPAGE  GALLERY  BLOGAttn:RR
02-24-2017 03:58 PM  6 months agoPost 13
yongary

rrApprentice

Manchester, NH

My Posts: All  Forum  Topic

No reverse polarity protection

Nope, it does not have it. By the way, I checked the batteries and they seem fine now. They read 3.85v/cell and 8 ohms/cell. They don't look puffed. Do you guys think I can still use those lipos?

PM  EMAIL  GALLERY  Attn:RR
02-24-2017 04:34 PM  6 months agoPost 14
Flyin for Jesus

rrApprentice

Dana Point, Ca. 92629

My Posts: All  Forum  Topic

Yep, still use them until they cease to perform.

PM  EMAIL  Attn:RR
02-24-2017 04:40 PM  6 months agoPost 15
Pistol Pete

rrProfessor

Seffner, FL

My Posts: All  Forum  Topic

Since you are getting an OHM reading, this tells me you have a decent charger.

Althought 8 mohm is not ideal for a new battery (assuming they are new), they are still good. Hopefully you got a reading when new for comparison.

You can cycle them at least a couple of times (discharge at highest amp setting) and verify mAh capacity vs label.

Some go by if they cant hold 70% of capacity, they get replaced and downgraded to bench set-ups or into a plane since some dont pull as much amps as a heli can (depending on flying style)

Verify wiring before plugging into charger as such a high discharge can cause loose wires or worst, shorted plates. Since your charger states otherwise then short of removing packaging to verify solder, the other alternative is to give them a good tug.

As for the ESC, just plug a batt to it. It will arm and work or not. Sorry but its the only thing you can do (or replace if in doubt) unless you have a O-scope.

~~Enjoying the hobby one flight at a time~~

PM  EMAIL  HOMEPAGE  GALLERY  BLOGAttn:RR
02-24-2017 05:07 PM  6 months agoPost 16
Heli_Splatter

rrElite Veteran

USA

My Posts: All  Forum  Topic

An ohm reading for a good battery is 1ohm. So you can see that the battery is damaged. You should use the battery with caution. Make your own judgement. If the aircraft is valuable, I would not fly it on this battery. Having said that, I admit that I have flown puffed batteries.

Only you can determine their safety. It is on you.

PM  EMAIL  GALLERY  Attn:RR
02-24-2017 05:18 PM  6 months agoPost 17
dkshema

rrMaster

Cedar Rapids, IA

My Posts: All  Forum  Topic

8 OHMS per cell???

Or 8 milli ohms (0.008 ohms).

If it's 8 ohms, those batteries are nothing more than expensive, puffy paperweights. 8 milliohms, that would be fine.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

PM  EMAIL  GALLERY  Attn:RR
02-24-2017 05:37 PM  6 months agoPost 18
yongary

rrApprentice

Manchester, NH

My Posts: All  Forum  Topic

You are right

Correction, 8 milli ohm/cell. They are not new batteries. I got them as used and the original owner said that he used them about 50 times. Again, thanks for the feedback!

PM  EMAIL  GALLERY  Attn:RR
02-24-2017 05:55 PM  6 months agoPost 19
Heli_Splatter

rrElite Veteran

USA

My Posts: All  Forum  Topic

Milli Ohm - That is what I meant. Sorry for confusion.

PM  EMAIL  GALLERY  Attn:RR
02-24-2017 09:39 PM  6 months agoPost 20
EEngineer

rrProfessor

TX

My Posts: All  Forum  Topic

I was gonna say about 8 ohms/cell.....

Like dk said, 8 milliohms/cell is ok.

With regards to the internal resistance of the batt cells, consider this....

If one were drawing 100A from 8millohms per cell, then the power dissipated in resistive heat in each cell is:

P = I*I*R = 100 * 100 * .008 = 80W

No wonder the batts get hot....

FWIW

Logo 600SXs, 700XX, 800XX

PM  EMAIL  GALLERY  Attn:RR
WATCH
 2 pages [ <<    <    ( 1 )     2     NEXT    >> ] 932 views POST REPLY
Scorpion Power Scorpion Power
HelicopterMain Discussion › Puffed lipo while connecting to esc
 Print TOPIC  Make Suggestion 

 9  Topic Subscribe

Tuesday, September 19 - 8:01 pm - Copyright © 2000-2017 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online